Despite being the heartthrob that all the girls want, Chiaki Ichihara has a secret that's far from charming: she has a serious obsession with breasts! Her desire for them is so strong that she struggles to function normally without touching them. In order to fulfill her desire and keep it hidden from her classmates, she has teamed up with Hana Harumi, whose perfectly-sized and shaped bust may just be exactly what Chiaki has been searching for. Will their unusual partnership evolve into a unique bond over their shared love for bosoms?