Yamato Shinmei

Yamato Shinmei was the younger brother of Masamune Shinmei. He first appears in Yuki's flashback in Story 43.

Background
It is stated that after both him and Masamune's father passed away, his mother have been taking care of the both of them.

Sometime during the story, Yamato became a middle schooler in Enju Middle School.

Yuki states that Yamato passed away in an accident sometime during "April" of the storyline. He fell from the 4th floor of the middle school building while playing with friends.

His death deeply affected the rest of his remaining family members. His mother broke down from the shock and is implied to have become physically a little unwell. His brother was also sorrow-stricken but put on a cheerful front and didn't let on about anything.