Issho ni Kurasu Tame no Yakusoku wo Itsuka

"Sana, wanna come to my place?"

Miura Sana meets Fujiki Gorou once again after he has been absent from her life for a long time on the day of her father's funeral. Sana, who lost her parents and Gorou, who lost his best friends become a family.

Two and a half years later, Sana is now 14 and Gorou is 35 years old.
The story depicts the normal and not-so-normal daily life of 2 people with 21 years difference in age.