Boku wa Kimitachi wo Shihai suru

Seven women, one man, a suspenseful harem story! 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. (Source: Kodansha, translated)