That's an Incredible Ultimate Weapon S01 E05

Shiki Aoki (as Mayuko Nise (voice)) Junya Enoki (as Rika Honjou (voice)) Akira Sekine (as Kuon Shinzaki (voice)) Yuuichirou Umehara (as Sniper Mask (voice)) Haruka Shiraishi (as Yuri Honjou (voice)) Jun Fukuyama (as Mamoru Aikawa (voice)) Yoko Hikasa (as Yayoi Kusakabe (voice)) Megumi Ogata (as Shinji Okihara (voice)) Koji Yusa (as Kazuma Aohara (voice)) Chika Anzai (as Ein (voice)) Shizuka Itoh (as Dealer Mask (voice))

gore survival school psychological thriller based on manga ecchi shounen anime suspense horror