Tomoya Matsunaga

Tomoya is not only popular among girls, but he's also a player. A narcissistic guy who flirts and constantly and steals the hearts of many girls in his school. But what if there is one who doesn't fall for his good looks? He's a bit overprotective of his younger sister.

He falls in love with Mari and confesses to her in chapter 20. Before that he often tried to flirt with her already which she coldly rejected as his games but in his confession he tells her that he's serious and she also believes him.