Masumi Yamato is Sho Yamato and Ayumu Yamato's mother and wife of Takeshi Yamato she met Takeshi when he arrived to earth. Masumi Yamato and Takeshi Yamato got married and had Sho and Ayumu. She appears in episodes 1,33,34,49,50,51,52.
Masumi Yamato is quite strict but cares a lot about Sho and Ayumu. She doesn't like the fact that Sho keeps riding his MTB and doesn't care about doing anything else. She is very loving towards Takeshi Yamato ( her husband ) too.