Shokushu Nyurunyuru Inma Kyoushitsu ga Gensoukyou Iri Append 38-Nichi go

Thirty-eight days after a mysterious tentacle classroom appears in Gensokyo, numerous girls have already fallen victim to its traps. Attempting to resolve the incident, several heroines willingly enter the classroom, only to be captured and subjected to relentless tentacle attacks. The tentacles prove highly adaptable, demonstrating the ability to mimic the unique powers of the girls they ensnare. Throughout the ordeal, powerful figures like Remilia Scarlet and Yukari Yakumo are completely overwhelmed in various scenarios. Ultimately, these prominent characters are depicted trapped in highly compromising and vulnerable situations with the tentacles.