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Hanaoka Nao's mother, Yuriko, works as a confectioner at Kogetsuan, a traditional Japanese sweets shop. Nao meets Takatsuki Tsubaki, the owner's six-year-old son, and they become childhood sweethearts. Tragedy strikes when Tsubaki's father is murdered. Nao's mother is arrested based on Tsubaki's testimony, and Nao is left homeless after her mother's death. With Nao as the daughter of a murder suspect and Tsubaki as the victim's son, they part ways with bitterness. Over 15 years later, Nao and Tsubaki cross paths again during a Japanese confectionery competition. Tsubaki, unaware of Nao's true identity, is captivated by her creations and impulsively proposes marriage. Nao, determined to prove her mother's innocence, conceals her past and agrees to marry Tsubaki, gaining entry to Kogetsuan. Little do they know the challenges awaiting them. Despite life's adversities, Nao and Tsubaki's bond deepens as they're drawn together. The truth behind the events of 15 years ago remains a mystery. (Source: MyDramaList) ~~ Adapted from the manga series "Watashitachi wa Douka Shiteiru" (私たちはどうかしている) by Andou Natsumi (安藤なつみ).

Newlyweds Nana and Shota Tezuka move into an apartment. Two situations, different from the drama series, take place: "What if Shota attends the resident's meeting and not Nana?" and "What if exchange murder game doesn't begin?"