Oneesan-ha no Ore ga Naze Chicchai Kimi o Suki ni Natta no ka?

During spring break after middle school, Sky Tochika rescues a tiny girl from being crushed on a crowded train. He takes her for an elementary school student, but after starting high school, he discovers she is in his classroom. Chito Naruse is only 140 centimeters tall and runs on energy drinks, yet Sky sees that she is a beautiful girl. Sky is devoted to tall, older women, so he assumes Chito is far outside his romantic preferences. But Chito boldly vows to turn his obsession upside down. Their romance begins as a tug-of-war between Sky’s love of older women and Chito’s determination to win him over.