Tsuma, Shougakusei ni Naru.

After Takae's death, the emotional life of Keisuke Niijima and his daughter Mai seems to stop even though ten years pass. They continue working and sharing the same home, but barely know how to live around the absence of the woman who once held their family together. Then an elementary school girl knocks on their door and calmly announces that she is Takae reincarnated.

The child proves her identity with memories no stranger could know, bringing warmth back into the Niijima home for the first time in years. The miracle carries a reality Keisuke cannot ignore, however: Takae's new name is Marika, and she has a mother, a childhood, and another family that he has no right to take from her. Between joy, jealousy, and grief, they must learn that having someone return does not mean time itself can move backward.