Masaki Maruo

Maruo is a friend of Kazuto's and tries to give hints to Narue. He is also a childhood friend of Yagi. He is a member of the school's baseball team (which means he's a bit of a jock), and a self-styled expert on all things romantic. He's also surprisingly open-minded about a lot of things, which means whenever something strange happens to either Kazuto and Narue, or anyone else for that matter, he takes things in stride.