From Friday, July 24 through Sunday, August 23, 2026, the Otemachi, Marunouchi, and Yurakucho area (the Marunouchi area) turns into a summer playground and classroom that kids and adults can enjoy together, with the first "MARUNOUCHI SUMMER FEST." Aiming to become a new seasonal tradition for the neighborhood, the festival rolls out more than 100 varied experience programs across the district.
A Flower-Filled "Corridor" Cools Marunouchi Naka-dori Avenue
Exclusive Perks for People Who Work in Marunouchi
Perk 1: Free drink for the first 30 people each day
Period: July 24 (Fri) – August 23 (Sun), 31 days total
Participating restaurants:
- Marunouchi Happ. Stand & Gallery (1F, Marunouchi 2-chome Building) — draft beer, blue citrus soda (non-alcoholic)
- GARB Cheers OTEMACHI (1F, Otemachi Financial City South Tower; closed Saturdays and Sundays) — draft beer, Cheers Blue cocktail, soft drinks
How to join: Show the coupon screen from the "MARUNOUCHI WORKERS" member site (https://www.marunouchi-workers-portal.com/) at the counter
Coupon release schedule: ① July 24–30, ② July 31–August 6, ③ August 7–13, ④ August 14–23
Each day, the special drink is available to the first 30 "MARUNOUCHI WORKERS" members; one drink can be redeemed per coupon period at either restaurant. Alcohol is served only to guests aged 20 and older.
Perk 2: Special access to Marunouchi's regular summer events
Workers get exclusive participation perks and reserved slots at Marunouchi's long-running summer events, including "Marunouchi Street Park 2026 Summer," "Marunouchi Bon Odori 2026," and "Otemachi Ennichi 2026," along with other programs held around the area.
A summer-only treat for everyone
Open to all visitors, not just "MARUNOUCHI WORKERS" members — "Happ." adds a limited-time shaved ice menu made with rare natural ice from "Yondaime Tokujiro," craftsmen based in Nikko. Slowly frozen into a dense block, the ice shaves into a fluffy, snow-like texture that melts almost instantly.
Shaved ice menu: ¥1,485 (tax included) each
- Yondaime Tokujiro tochiaika strawberry syrup
- Yondaime Tokujiro blueberry syrup
- Matcha syrup made with Ippodo Tea matcha
- House-made green plum syrup
MARUNOUCHI SUMMER FEST Overview
Name: MARUNOUCHI SUMMER FEST
Period: July 24 (Fri) – August 23 (Sun), 2026
Location: Throughout the Marunouchi area
Organizer: MARUNOUCHI SUMMER FEST Executive Committee, composed of four Otemachi-Marunouchi-Yurakucho area organizations including Mitsubishi Estate Co., Ltd.
Official site: https://www.marunouchi.com/lp/marunouchisummerfest2026/
Dates, days, and hours vary by program, and some run outside the main festival period. Not every workshop or event takes place throughout the entire run, and program details are subject to change.
More Than 100 Ways to Enjoy Marunouchi This Summer
1. Marunouchi Summer Mission
The Marunouchi Point app runs a stamp rally, "Marunouchi Summer Mission," alongside the festival. Scanning QR codes at select events, workshops, and spots around the neighborhood earns stamps. Collecting more stamps increases a visitor's share of a total of 1 million Marunouchi Points, and everyone who reaches 10 stamps is entered into a drawing for a bonus 100,000 points. Details will be posted on the Marunouchi Point app in late July.
2. Marunouchi Summer Workshop
More than 50 Marunouchi-area companies team up for hands-on workshops for kids and adults
More than 50 shops and companies across the Marunouchi area are teaming up on "Marunouchi Summer Workshop," centered on job-experience programs that families and children can join. Some programs welcome same-day, no-reservation visitors during the festival. The full lineup of events and workshops is listed on the official "MARUNOUCHI SUMMER FEST" site: https://www.marunouchi.com/lp/marunouchisummerfest2026/
3. Marunouchi Street Park 2026 Summer
Period: July 24 (Fri) – August 23 (Sun)
Location: Marunouchi Naka-dori Avenue
Organizer: Marunouchi Street Park 2026 Executive Committee
Held as a social experiment exploring future uses for Marunouchi Naka-dori Avenue, this year's edition takes on the theme "Playful Chill Street – Cooling Day / Neon Night," focusing on staying comfortable through the summer heat with mist, shade, breeze, sound, and scent installations. The space also takes on different looks by day and night, giving people who work in Marunouchi a place to unwind after work and building nighttime energy in the area.
Official site: https://marunouchi-streetpark.com/
4. Kokyo Gaien National Garden: "Path of Japanese Lanterns"
Period: July 24 (Fri) – 25 (Sat), 11:00 AM – 9:00 PM each day (cancelled if rainy)
Location: Wadakura Fountain Park, Kokyo Gaien National Garden
Organizer: NPO Otemachi-Marunouchi-Yurakucho Area Management Association
Japanese umbrellas are displayed at Wadakura Fountain Park, lit up after dark to create an inviting nighttime scene that showcases Japanese culture.
Official site: https://www.marunouchi.com/pickup/event/10210/
5. Marunouchi Bon Odori 2026
Date: July 24 (Fri), 4:00 PM – 10:30 PM
Location: Gyoko-dori Avenue
Organizer: Otemachi-Marunouchi-Yurakucho Summer Festival Executive Committee
A festival tower is set up facing Tokyo Station's Marunouchi building. Office workers from nearby buildings join the "Bon Odori Booster Squad" performance team and visitors for bon odori dancing set to taiko drumming and J-pop. The venue also offers a hands-on "uchimizu" (water-sprinkling) booth, a heat-mitigation practice promoted by the Ministry of the Environment and the Tokyo Metropolitan Government, along with parasol rentals.
Official site: https://www.marunouchi.com/pickup/event/9833/
6. Mitsubishi Ichigokan Museum: "Artists Who Gathered at the Café — From the Impressionists to Van Gogh, Toulouse-Lautrec, and Picasso"
The museum runs several special programs during the "MARUNOUCHI SUMMER FEST" period.
Official site: https://mimt.jp/ex_sp/cafe/event/
Costume event — "For Experts and First-Timers Alike: Let's Meet in Marunouchi, Dressed for 19th-Century Paris"
Date: July 25 (Sat), 3:00 PM – 8:00 PM
A one-day costume event inspired by the real Café des Incohérents, known in 19th-century Paris for its costume gatherings. This year's theme is "19th-century Paris" — visitors are invited to dress as they like and immerse themselves in the world of the exhibition.
Evening hours to enjoy the museum after dark (open until 8:00 PM)
Dates: July 24 (Fri), 25 (Sat), 31 (Fri), August 7 (Fri), 12 (Wed), 14 (Fri), 21 (Fri)
During extended evening hours, select galleries feature special musical programming, along with stories about café culture aimed at adult visitors.
Gramophone and 78-rpm record mini concert
Dates: August 7 (Fri), 14 (Fri), 21 (Fri), around 6:30 PM – 6:50 PM each day
As part of the "THE WAY OF→" pilot project, the Tokyo University of the Arts Library shares gramophones and 78-rpm records from its collection in a concert held during the August evening hours.
7. Otemachi-Marunouchi-Yurakucho Eco Kids Expedition 2026
Period: July 27 (Mon) – August 19 (Wed)
Location: Various spots around the Marunouchi area
Organizer: Otemachi-Marunouchi-Yurakucho Eco Kids Expedition Executive Committee
Aimed at the next generation, this program partners with companies and shops across the sustainability-minded Marunouchi area on a variety of hands-on workshops. Over summer vacation, parents and children learn together and get a chance to think about the environment and society.
Official site: https://ecokids.tokyo/
8. Todai Week@Marunouchi
Dates: July 28 (Tue) – 29 (Wed), 6:30 PM – 8:30 PM each day
Location: 3×3 Lab Future, DMO Tokyo Marunouchi, Inspired.Lab
Organizer: MEC-U Tokyo Lab
Faculty from a range of fields at the University of Tokyo give talks and join cross-disciplinary discussions, sharing the university's latest research and creating opportunities for exchange.
Official site: https://todaiweek-marunouchi.jp/
9. ACT5 Plogging Around Marunouchi and Naka-dori Avenue 2026
Date: July 29 (Wed), 5:00 PM – 7:00 PM (check-in from 4:45 PM)
Location: Around Marunouchi Naka-dori Avenue
Organizer: Otemachi-Marunouchi-Yurakucho SDGs ACT5 Executive Committee
Plogging — jogging combined with picking up litter — is a popular SDGs-themed sport that started in Europe. In partnership with Plogging Japan, the event tackles litter in the Marunouchi area while supporting the well-being of people who work there.
Official site: https://act-5.jp/act/2026act3-2/
10. Otemachi Ennichi 2026
Period: July 30 (Thu) – 31 (Fri), 5:00 PM – 9:00 PM (partly cancelled if rainy)
Location: Otemachi Naka-dori Avenue, Otemachi Financial City (1F and 2F), Kawabata Ryokudo
Organizer: Otemachi-Marunouchi-Yurakucho Summer Festival Executive Committee
Food stalls and takeout menus from nearby restaurants join classic festival games with an elevated, traditional touch, produced with cooperation from Hoshinoya Tokyo — including flower-scooping and treasure-fishing games — plus a tent booth serving special dishes prepared by the head chef of "Sushi Otemon." New this year is a stage segment where people who work in the Marunouchi area take part in a singing contest.
Official site: https://www.marunouchi.com/pickup/event/9868/
11. "TOKYO MER: Capital Crisis" Marunouchi Mission
Period: July 31 (Fri) – September 20 (Sun)
Location: OO Plaza, 1F, Marunouchi OAZO
Organizer: Mitsubishi Estate Co., Ltd.
The Marunouchi area, one of the filming locations for the movie "TOKYO MER: Capital Crisis," hosts a special event marking the film's August 21 release, including a limited-time display of the motorcycle-style ER vehicle (T03) and shopping promotions that let visitors enjoy the neighborhood.
Official site: https://www.marunouchi.com/lp/marunouchi-mission-tokyomer-tieup/
12. LEGO® Festival in Marunouchi 2026
Period: July 31 (Fri) – August 23 (Sun)
Location: Marucube (1F, Marunouchi Building) and other spots around the Marunouchi area
Organizer: Mitsubishi Estate Co., Ltd.
Following last year's well-received run, the LEGO® Festival in Marunouchi returns under the theme "Play Brings the City Together," with a LEGO® pop-up store, 3D model displays, a LEGO® ONE PIECE stamp rally, and a hands-on LEGO® Botanical Collection build — programs for kids and adults alike.
Official site: https://www.marunouchi.com/lp/legofestival2026/
13. Resource Circulation Starting From Compost — "Circulate, Grow, Connect" Project Vol. 2: "Grow"
Date: August 4 (Tue), 12:00 PM – 1:30 PM
Location: 3×3 Lab Future
Co-organizers: Otemachi-Marunouchi-Yurakucho SDGs ACT5 Executive Committee, Otemachi-Marunouchi-Yurakucho Area Environmental Symbiosis Community Development Association
A great pick for a summer-vacation science project — participants grow organic leaf vegetables using nutrient-rich compost.
Official site: https://act-5.jp/act/2026act2-9/
14. Marunouchi's "Small Creatures" Survey — Searching for Insects That Help Pollinate Flowers (Summer Edition)
Date: August 5 (Wed), 7:40 AM – 8:30 AM (rain date: August 12)
Location: Meeting point at Marunouchi Brick Square Building 1 Plaza (the group then walks and observes along the way)
Organizer: Otemachi-Marunouchi-Yurakucho Area Environmental Symbiosis Community Development Association
Walking the neighborhood in the morning, participants photograph insects gathering on flowers with their smartphones as part of a creature survey. A specialist guide joins on the day, making it approachable for beginners.
Official site: https://www.ecozzeria.jp/ (scheduled to go live in early July)
15. Marunouchi Summer College 2026
Period: August 12 (Wed) – 14 (Fri), 10:00 AM – 5:30 PM each day (final day until 6:00 PM)
Location: 3×3 Lab Future
Organizers: Mitsubishi Estate Co., Ltd., Otemachi-Marunouchi-Yurakucho Area Environmental Symbiosis Community Development Association
A hands-on learning program for high school and university students featuring talks from guest speakers active across various fields, fieldwork, and dialogue-based workshops, giving participants a chance to think through social issues and career paths and present ideas as a team.
Official site: https://www.ecozzeria.jp/events/msc/msc2026.html
16. Otemachi-Marunouchi-Yurakucho "Shizen no Copain" — Peering Into Tiny Waterside Creatures With High-Performance Microscopes
Date: August 18 (Tue), 1:30 PM – 3:45 PM
Location: 3×3 Lab Future
Co-organizers: Tokyo Tatemono Co., Ltd., Mitsui & Co., Ltd., Mitsui Fudosan Co., Ltd., Mitsubishi Estate Co., Ltd., Otemachi-Marunouchi-Yurakucho Area Environmental Symbiosis Community Development Association
Families observe the creatures living in and around "Hotoria Plaza," a green space in the heart of the city — searching for creatures with homemade tools and viewing the microscopic world through a high-performance optical microscope. Entomologist Suda, a leading expert in dragonfly research, joins as guest instructor, sharing the wonder of waterside creatures from an expert's perspective.
Official site: https://www.ecozzeria.jp/events/env/copain202608.html
17. TOKYO AfterDark in Marunouchi
Period: Now through August 14 (Fri)
Location: Marunouchi area
The Marunouchi area rolls out an evening-focused lineup, including night tours around the Imperial Palace and other Marunouchi sights, plus a special hopping pass offering discounts at area restaurants and bars. On Mondays in July, in partnership with marunouchi HOUSE, a special DJ booth and photo booth are set up so visitors can enjoy nighttime in the neighborhood.
This program is supported by the Tokyo Metropolitan Government and the Tokyo Convention & Visitors Bureau's nighttime tourism promotion grant.
Official site: https://www.marunouchi.com/lp/tokyo-afterdark/
18. BEER TERRACE in (marunouchi)HOUSE 2026
Period: Now through September 30 (Wed)
Location: marunouchi HOUSE, 7F, Shin-Marunouchi Building
Hours: Weekdays and Saturdays 11:00 AM – 11:00 PM (some restaurants stay open as late as 4:00 AM the next morning); Sundays and holidays 11:00 AM – 10:00 PM
The rooftop beer terrace on the seventh floor of Shin-Marunouchi Building returns for another year at marunouchi HOUSE. Guests can enjoy chilled beer, cocktails, and each restaurant's signature dishes on an open-air terrace with a breeze and open city views, along with music setting the mood for a relaxed evening.
