A heroine who is the incarnation of a crane, captured in a cell floored with tatami mats, forced sexual service to the enemy, given continuous orgasm and end up insulted, finally her mind gets broken

Humanity was under attack by an army of inter dimensional monsters. Men were killed or enslaved in horrendous conditions and were used to give birth to monsters. A world in chaos ... A few years of

The protagonist transferred to a new college with a lot of girls. But the girls rejected his presence, spearheaded by a hateful leader. She was the class president, Kana. Driven to a corner, the