まやか姉さんは噓がつけない

Junya is a third-year junior high school student. He's good at sports, but he's not so good at studying...or rather, he's really bad at it. Recently, he's had a problem. His childhood friend, Mayaka-san, keeps messing with him! Does that mean she likes him? The beginning of a romantic comedy where he's at the mercy of a liar who can change his appearance!