Koizumi hikes up Mount Tsukuba in order to work up an appetite for its local ramen shop. Misa's younger brother Kenta tries to tackle the sizeable Buta Yarō ramen in Akihabara, he becomes motivated after seeing Koizumi easily manage the mega-sized portion. Later, Misa, believing Koizumi to have some secret behind her beauty, inadvertently ends up ordering a ramen full of back fat alongside her, leading to an addiction.