Nana to Kaoru Arashi

Summer vacation is approaching, but Nana has no time to look forward to that. Entrance exams are also coming up, and she's fretting over her worst subject. An encounter in the library provides a solution in the form of an invitation to study with Tachibana. Japanese history, that is. Meanwhile, Kaoru encounters the author who he reguards as his mentor in his favorite subject. That's definitely not Japanese history.