The content below is entirely editable.
Chizuna? You mean THAT Chizuna-chan?
Shin Eda is Kazuna's foster father. He cares deeply for Kazuna and has offered to adopt him. Shin was Shizuna's best friend since their school days and when Kazuna's mother died, Shizuna sent Kazuna to live with Shin and his wife Natsuko. Shin lies about Shizuna's death and doesn't speak much about Momoko-san, if at all. However, it is Shin who peaks Kazuna's curiosity in finding his family. In a flashback, Kazuna remembers Shin showing him a family album that has a picture of Chizuna at a ShiChiGoSan festival. This also triggers a recurring dream in which Kazuna remembers seeing Chizuna coming down the hallway with the family cat, which she has killed to drinks its blood. Shin is the more layed-back persona and less forceful than Natsuko, which causes him to be less prominent in the story. He is also kinder to Chizuna than Natsuko, who claims to be afraid of her.