The table tennis club's annual summer training camp. Manager Mitsuki is also doing her best. Perhaps because she was more enthusiastic than usual, a junior colleague collapses on the first day. She ends up taking care of him by sharing a room with him. She acts like she doesn't notice, but... the junior colleague can't suppress his throbbing desire, and masturbates when he sees Mitsuki asleep. Mitsuki gently leads the younger boy with a handjob so as not to hurt him when he is found out and panics. The two of them suddenly become closer, and they start having a relationship, hiding it from everyone, during the camp...