We're On Our Own From Here

Haruki is a second year in high school, and is secretly in love with his best friend, Ryusuke. He swears he’s content with their relationship, but when a girl starts showing interest in Ryusuke, Haruki’s feelings spin out of control. He confesses, and to his surprise, Ryusuke responds…?

(Source: Kodansha USA)

Note: Includes one extra chapter.