Minori can't help but be extra-protective of his cute friend Mizumo. After all, Minori's family raised Mizumo after his selfish parents left he and his siblings to fend for themselves! But when Minori learns that the now-grown Mizumo is secretly sleeping with random men in order to make money, a strange, fiery pain rips through his heart...and the burning simply won't go away! In order to keep Mizumo all to himself, Minori is willing to surrender his meager paycheck week after week. While it's true that he can buy Mizumo's time and his body, will he ever lay claim to his friend's heart?