Just before the start of summer break, Kyousuke is summoned to Eiri's home. Academy administration readily approves the trip, and he heads home with Eiri! They thought it would just be the two of them, but Renko and Ayaka, after winning parole with their exam scores, decide to tag along. Since the Akabane are a family of assassins, Kyousuke is, to be honest, more than a little uneasy. But they are met with an unbelievably warm reception at House Akabane. Even as the others appreciate the pleasant atmosphere, Eiri is sullen the whole time. The sweet, summery fourth installment of the hardcore love comedy where the more he loves, the more dangerous it becomes.