Selama reuni kelas, sekolah tiba-tiba berubah menjadi dimensi terisolasi tanpa peringatan. Teriakan dan jeritan tidak mendapat respons. Haruka Sato, seorang pengangguran berusia 26 tahun, harus bertahan hidup dengan bekerja sama dengan tujuh mantan teman sekelasnya. Segera, kondisi ekstrem mulai mengikis kewarasan mereka, dan keinginan tersembunyi Haruka mulai menguasai dirinya.

During a class reunion, the school became an enclosed dimension without warning. Yelling and screaming brought no response. 26-year old unemployed Haruka Sato has to survive by cooperating with seven of his former classmates. Soon, the extreme conditions began to eat away at their sanity, and Haruka's hidden desires began to take hold.