Ore no Ichizu o Jama Suru Aitsu

Fifth-grader Osanai Wakaba is smitten with his homeroom teacher. Eager to become a man worthy of her, he puts on an act of maturity far beyond his actual age. However, when his childhood friend Wakanouchi Kai discovers his secret, she begins teasing him mercilessly. The truth is that Kai also harbors feelings for Wakaba, and she attempts to win his attention through flirtatious maneuvers. This sets the stage for a "double unrequited love" romantic comedy, following a young boy's uphill struggle to resist the seductive provocations of his childhood friend.