父が死んだ日、「鬼軍曹」と恐れられるドS担任教師・鬼久保凪と俺の同居が始まった――。言動はドS、躾は厳しいが家庭的な凪に俺は初恋!発情!ドSなのに、ドSなの、に……!前途多難な初恋の行方は?

When Tanami Riku's father died in a traffic accident, he was left all alone. Then suddenly a guy named Onikubo Nagi came and demanded to be his guardian in place of his father, who was actually Nagi's former teacher. Then he applied as Riku's homeroom teacher! He pushed himself into Riku's life without even asking for permission. Living with the Super Sadistic Teacher was unbelievably harsh. What exactly did Nagi want with Riku?