Rin has a secret love for the tutor's protection. At first glance, it's a good young man's guard, but the truth is that it's just a waste. He made debts by gambling and was frightened by the collection of dark money. Rin gradually becomes a good relationship with Mamoru without knowing such a thing ... One day, Orihara, a collection of dark money, comes under Mamoru. Orihara found a photo of Rin on Mamoru's smartphone.