The first book is divided into 3 small chapters containing the individual background stories of 3 guys, also depicting the kind of love they have towards Nishioka Nagi. These 3 guys ; Kusakabe Shuichi, Kusakabe Shuji and Nishioka Takashi secretly falls in love with the same girl unknowingly in their past life and neither of them confessed until they separate ways. Having to encounter again in the present life, they begin to recall memories... some even rekindling "old feelings". But will either of them finally step up and be ready to face her while having their dilemmas and unresolved issues in their lives? Who's unrequited past love will finally be returned?
16 parts