17LIVE Hosts First-Ever mezzo piano Collaboration Event Amid Heisei Revival Boom

The 17LIVE live streaming app is holding its first-ever collaboration event with mezzo piano junior, the beloved teen fashion brand that captured the hearts of girls across Japan in the early 2000s. The event, titled "Our 'Favorites' from Back Then Are Forever. mezzo piano Colorful Party," is running from May 1 to May 15, 2026, and is open to all 17LIVE users.

mezzo piano junior rose to prominence in the early 2000s, drawing a devoted following among elementary and middle school students. The brand's original characters — including the fan-favorite Beriee-chan — became icons of the era. Fueled by the current Heisei revival boom, mezzo piano has seen a surge of renewed attention, with revival items going back on sale and excitement spreading from adults who grew up with the brand to a new generation of younger fans.

During the event period, special mezzo piano-themed collaboration gifts (paid) are available within the app. Users who achieve certain milestones or rank at the top of the leaderboard can earn limited-edition digital prizes and official merchandise — including a Beriee-chan face pochette and nail chips. Prize conditions vary by item, so full details are available on the event page in the 17LIVE app.

Event Overview

• Event Period: May 1, 2026 (Friday) – May 15, 2026 (Friday)
• Eligibility: 17LIVE users

Event dates and content are subject to change without notice.

Selected Prizes (Images for Reference Only)

Digital Prizes

mezzo piano (Beriee-chan) Collaboration Badge

Collaboration Profile Background

Merchandise

Beriee-chan Nail Chips

Face Pochette [Beriee-chan]

Front Hair Clip [Devily-chan]

Face Mirror [Blue Beriee-chan]

Beriee-chan Wish Core Heart Trainer

[Baby Beriee-chan] Gauze Blanket [Organic]

Additional prizes and further event details can be found on the event page within the 17LIVE app.