Watashitachi wa Douka Shiteiru

Hanaoka Nao’s mother Yuriko is a single parent and a live-in confectioner at Kogetsuan, a traditional Japanese confectionery shop of long standing. That is how Nao meets Takatsuki Tsubaki, the 6-year-old son of the owner of Kogetsuan, and they become each other’s first loves. However, Tsubaki’s father is stabbed to death by someone. Nao’s mother is arrested as the suspect based on Tsubaki’s statement.