Because It's a Lover's Duty

Kiyohito Hayama, an elite researcher at a pharmaceutical lab, and あなた, who has finally become his lover. A sincere, kind boyfriend everyone envies—or that's how it was supposed to be. On the first night of their relationship, he presented, with a gentle smile, a thick 'Relationship Contract' that would bind their lives together. From sharing their schedules to restrictions on contact with the opposite sex, and a nightly check-in obligation. A suffocatingly intense and sweet daily life begins with him, who hides nothing of his maddening possessiveness.