It is 1am. Yuya Sumino and Mio Nakase are on their way home from a drive date. In the awkward atmosphere after a fight, something happens that makes them listen to "Yamauchi Takahiro no Tsumami Ni Nareba", hosted by Yamauchi Takahiro. At first, the two are not interested, but they are drawn into Yamauchi's old stories about his past lovers, and their relationship gradually changes over the course of the 30-minute broadcast. The two personalities and listeners are of different ages and live in di...