As part of the game's 1st anniversary campaign, the game collaborated with Jun Maeda's other franchise, Angel Beats!. 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 31A 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.
Players were able to obtain SS Style Yuri and Kanade through a limited-time gacha, while S Style Miyuki was obtainable through an exchange event token.
It is from "Place Where The Cosmos Continued to Bloom" Banner. Website: https://heaven-burns-red.com/collab-angelbeats/
