Yuta gets dumped by his first girlfriend. His sister-in-law Airi, who was worried that he could not recover from the shock and was stunned, made an unexpected proposal. "You won't be dizzy forever! Hey, rub your boobs and cheer yourself up!" Yuta was startled by the sudden presentation of big breasts without a bra, but Airi's eyes were serious and didn't look like he was joking.
