Twenty Lillies

1-3. Heart no Okurimono (ハートのおくりもの)
Shiro had a weak heart, so she had been bedridden since she was little. A girl from her neighborhood named Kuro would always visit her and keep her company throughout the years. Eventually, Shiro's condition got to the point where she needed a transplant, or else she would die. Kuro then offers her heart to Shiro, and has hers replaced by a mechanical one. This story is about them adjusting to their new hearts and to their feelings for each other.

4-6. Futatsu no Rasen (ふたつのラセン)
Through the use of her research in parthenogenesis genetics, Kita-san from the Sciences and Mathematics Department had been able to have a child with a star athlete in the Physical Education Department, Minami-san. This is the story of how their child and family came to be.

7-9. Risutaato wa Zero kara (リスタートはゼロから)
…“She” is not the only one. A young girl, who suffered from a severe case of identity disorder, was abandoned by her parents and came to live together with her attending physician. Despite their peculiar relationship, the two were leading a quiet and comfortable life, until...

Included one-shots:
Volume 2: Perfect Communication, I Wish You, Yuru Daizai