Mayaka-Neesan Wa Uso Ga Tsukenai summary:
Junya is a third-year junior high school student. He's good at sports, but when it comes to studying... well, let's just say he's really bad at it. Lately, he's been troubled by something. His childhood friend, Mayaka-nee, has been messing with him in all sorts of ways! Could it be that she actually likes him...? Thus begins the romantic comedy where our hero is at the mercy of a deceptive, ever-changing heroine!