[Puzzle Box] Tadakano ただかの～正しい彼女の作り方～

Kazuya is in love with Wakana, his lifelong friend. He wants to tell her that he loves her, but he can't.... One day, Yosuke, his close friend, and Wakata start dating.... Kazuya is really shocked to hear that.... "I have to change myself...." He remembers an old man he met before. His name is Taizo and he says he is a master of love romance. Though Kazuya doesn't believe him, he visits his house....