High schooler Akira was raised as the heir of Kikunoyu, a sento bathhouse run by his grandfather and mother. He always had dreams of becoming a hero. But he quit baseball, which he'd been playing since he was young, and spent his days going to karaoke after school with his childhood friend Kacchan. One day, Kacchan receives an email from the idol talent agency sMiLea Production on a recommendation from the legendary idol Anela. Although Akira has no relation to it, it seems that he might be involved...

Confusion hits everyone at sMiLea Production when an article in a weekly magazine states that the person who forced Lin to retire from being an idol was Daiki. The group's lead still has yet to be decided, and there are rumors that the joint live performance will be canceled. But while everyone gets increasingly anxious, only Akira continues to believe in Daiki. Akira does his best to support LEGIT's work and make the joint live performance a reality with persistence and a positive attitude. One day, Akira runs into Daiki at the same school he attends for supplementary lessons...!