One of the most popular boys in his school. When he first meets Mei, he gets kicked by her. After giving her his phone number, Mei gets stalked and calls Yamato for help. When he gets there, he kisses Mei to get the stalker to go away. Then, he eventually grows a liking to her.

By episode 3, Yamato enters a relationship with Mei at his request. He is quite protective of Mei as he protects her of anyone who does anything rude to her or insults her. He also gives her a blue bracelet to symbolize their relationship.

Asami-chan describes Yamato as someone who thinks of others more than anyone else, protects what should be protected, and cares for others despite having his own problems to deal with.