Heaven Burns Red (ヘブンバーンズレッド, Hebun Bānzu Reddo) (stylized in block capitals) is a free-to-play mobile action game[citation needed] co-developed by WFS, inc. and Key.

[2] Heaven Burns Red is a turn-based role playing game in which the player can assemble a team of six out of 48 available girls and fight against extraterrestrial beings known as Cancer.

[2] Heaven Burns Red takes place in a world where the Earth is being attacked by mysterious extraterrestrial life forms called "Cancer."

The event titled "Place Where The Cosmos Continued to Bloom" (コスモスが咲き続けた場所, Kosumosu ga Sakitsuzuketa Basho) was available from February 2, 2023, and featured 3 of the franchise's characters: Yuri Nakamura, Kanade Tachibana, and Miyuki Irie.

In the collaboration story, Unit 1A found themselves in an unfamiliar place, which turned out to be the underground base of the SSS, however they could still use their Seraph weapons.

A 4-panel manga adaptation illustrated by Yū Tsurusaki began serialization on Kadokawa Corporation's G's Channel website and on the game's official Twitter account in Q4 2023.