Masaomi Tsutsui

Masaomi Tsutsui (筒井 昌臣, Tsutsui Masaomi) is Mari Tsutsui's 25-year-old brother who quit school early to work, already moved out and married at the age of 22. Their parents work all the time. Mattsun told him that he's in love with Mari and he said that he approved of it as long as Tomoya Matsunaga serious

Appearance
Masaomi is a purple eyed man with gold and black hair. He loves to wear his sunglasses in his forehead.

Personality
He is a bit punky and is shown to love mari very much,he also approves of tomoya.

Trivia
Mari calls him "Maa-kun" while he wasn't married.