If My Wife Becomes an Elementary School Student.

Keisuke Niijima, an office worker who is heartbroken and has lost the will to live after losing his wife in a traffic accident, and his daughter Mai, a NEET, they meet an elementary school student named Marika, saying that she is Keisuke's wife.

After Marika proves about things that only they know about Takae Niijima (the dead wife in the past), they both gradually believe that she is the reincarnation of Keisuke's dead wife and Keisuke quickly regains the will to live, while Mai is determined to do not become NEET.

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妻、小学生になる。