Ritsuka starts teaching Mafuyu how to play guitar. Ritsuka couldn't help but wonder why a beginner like Mafuyu would have a guitar like the Gibson he owned. One day, Ritsuka hears Mafuyu sing and it rocks him to the core so he asks Mafuyu to join his band, the seasons. To his surprise, Mafuyu declines. Then suddenly, someone named Hiiragi Kashima appears and he seems to know about Mafuyu's past... (thetvdb.com)