Yumi Mori

Yumi Morita, or Yumi Mori, is Haruki Hayashida's childhood friend, who later becomes her husband. She also appears in the bonus manga of Volume 4 of the Blu-ray & DVD.

Personality
Yumi was a free-spirited girl, who had a strong will and determination. When she was in kindergarten, she often challenged children her age and fought them. Hence, she was feared and was seen as ruthless by many. When she grew up

History
Yumi was Haruki Hayashida's childhood friend. She went to the same school as him and Ryohei Hayashi, where she would scare away her classmates.