Misadventures in First Love

Sana's heart was shattered when her first boyfriend, Yamato, who was fat but kind and whom she loved, suddenly dumped her. Sana can no longer believe in anything, and in order to break away from her past self... she becomes a super-junkie! However, as Sana leaves her feelings of love behind and walks on with her life, Koichi, the popular student council president, and Yamato, a popular actor who has become a handsome young man, appear in front of her...what will become of the pure-hearted girl whose first love got complicated ??

Source : Pixiv