C4 Connect's idle RPG Idle Girls The Girls of One Hundred Flowers (Idle Girls) is holding a collaboration event with the hit anime That Time I Got Reincarnated as a Slime, starting at 12:00 PM (noon) on Tuesday, September 8, 2026. To mark the occasion, a special TV commercial is also set to air from September 4.
A Dream Collaboration with That Time I Got Reincarnated as a Slime Comes True
That Time I Got Reincarnated as a Slime has captivated fans with the story of protagonist Rimuru, reincarnated into another world, and the bonds and adventures he shares with his many companions.
This collaboration brings a special original event depicting Rimuru's group as they are suddenly transported into the world of Idle Girls by a mysterious pillar of light.
During the collaboration period, popular characters from That Time I Got Reincarnated as a Slime will appear in the world of Idle Girls. Further details will be released gradually, so stay tuned for updates.
Collaboration Period
September 8 (Tue), 2026, 12:00 PM – September 28 (Mon), 2026, 11:59 PM
Pre-Registration Event "Enchanting Bunny Party" Starts Today
Ahead of the collaboration, the pre-registration event "Enchanting Bunny Party" has started today. Players can choose a partner from Rimuru, Milim, or Shion and create their own special invitation.
The event asks all players to work together to raise the "party excitement" level. Reaching the goal will reward every participant with collaboration-exclusive gacha tickets (up to 10) usable in-game once the collaboration begins.
A lottery will also offer chances to win collaboration-exclusive merchandise sets and Amazon gift codes.
Players hoping to secure the items needed for a strong start are encouraged to join through the special site.
※ Please check the special site for full details.
Special Site: https://tensura.c4connect.co.jp/
Collaboration Commemorative TV Commercial Airs From September 4 (Fri)
A TV commercial commemorating the collaboration is set to air starting September 4. The commercial offers a glimpse of how Rimuru's group looks and behaves after being transported into the world of Idle Girls.
Air Dates: September 4 (Fri), September 11 (Fri), and September 18 (Fri)
Broadcaster: Nippon Television
Air Slot: During the broadcast slot for That Time I Got Reincarnated as a Slime Season 4
The commercial will also be published on the Idle Girls official YouTube channel (https://www.youtube.com/@houchishoujo) from September 4 (Fri).
More Details to Be Revealed via Official Site and Social Media
Idle Girls and That Time I Got Reincarnated as a Slime come together for a special bunny party that spans two worlds.
Information about the characters involved, collaboration-exclusive content, and related campaigns will be released gradually through the Idle Girls official website and social media accounts.
Fans are encouraged to look forward to this special collaboration available only this autumn.
About the Anime That Time I Got Reincarnated as a Slime
That Time I Got Reincarnated as a Slime is a media mix based on the web novel of the same name, written by Fuse and originally serialized on the novel submission site Shōsetsuka ni Narō. Its abbreviated nickname is "Tensura."
A novelization with substantial additions and revisions to the web novel was first published as Volume 1 under the GC Novels imprint (Micro Magazine) in 2014.
Around the release of Volume 5 of the novels, a manga adaptation by Taiki Kawakami began serialization in Monthly Shonen Sirius (Kodansha) in May 2015, with collected volumes starting that October.
Several spin-off works are also currently in serialization, including 転スラ日記, 魔物の国の歩き方, 転生しても社畜だった件, 転ちゅら, and 魔国暮らしのトリニティ. As of February 2023, the series' cumulative circulation, including related books, had surpassed 40 million copies.
A TV anime first season began broadcasting in October 2018.
From January to September 2021, a TV anime second season and the spin-off anime 転スラ日記 aired consecutively over nine months.
In November 2022, the series' first theatrical film was released, subtitled Scarlet Bond, surpassing 1 million domestic moviegoers and earning ¥1.4 billion at the box office to become a major hit. A TV anime third season aired from April to September 2024, and following the finale of that season, a second theatrical film and a TV anime fourth season were announced.
About Idle Girls The Girls of One Hundred Flowers
Idle Girls is an idle RPG in which players recruit heroes from across history — reimagined as beautiful girls — and build their own strategy toward victory in a turbulent era.
The game can be enjoyed simply by leaving it running, while also offering alliance battles and other features for players who want to dive deeper. Detailed, beautiful illustrations and a wide range of character voices are included.
The game screen has also been renewed with new features added. Idle Girls for Browser requires no download and can be played on a large screen such as a PC.
- iOS Download: http://apple.co/2PjUtHi
- Android Download: http://bit.ly/2yX7cVP
- Browser Version: https://web.c4connect.co.jp
- Official X (formerly Twitter): @houchishoujo / https://x.com/houchishoujo
- Official YouTube Channel: https://www.youtube.com/channel/UCGRkVKDHOv2KX799a18qkzA
- Official TikTok: @houchishoujo / https://www.tiktok.com/@houchishoujo
- Official Strategy Site: https://game8.jp/houchishoujo
- Official Discord: https://discord.com/invite/GkG72xenbV
