Shizuru Roji is smitten with Nana, a fellow college student, yet apprehensive about revealing his feelings. His social anxiety and lack of confidence leave him no choice but to convey his emotions through verse. His predicament worsens when Kokoro Maida enters the picture, Nana's quirky cousin who calls him "Mama."
As Shizuru grows fond of Kokoro, his life becomes increasingly turbulent, but he also finds himself spending more quality time with Nana.