After forming a new unit, STC (“Square the Circle”), Setsu sets out on a national tour with Kaji and Arakawa. From Kanagawa to Shizuoka and Aichi, Kaji and Arakawa feel a response to their efforts in each place they play their concerts, whereas Setsu feels something is off about the unit's sound. Pondering the fundamental question of what STC's sound actually is, they set out to play their first solo concert. What lies ahead for them on the road of their sound…?!