Hey guys! Sorry for the late reply.
The manga I was looking for is indeed the 'If my wife is an elementary student'. I got the grade wrong HAHAHAHAH.
Anyways, thank you for helping me! And to those interested, let's enjoy the manga ^-^ reply
Hello, help me find this manga. The story is about a mother who got reborn as a middle school(?)kid who then met his husband and daughter. I remember that the daughter's name is Mai. The husband did not remarry and was still grieving the mother for over a decade.