Sosuke proposes to Saku, who is working part-time at Curry Shop Volcano at the corner of the intersection of School District 7, that he should sing the lyrics inspired by Saku. Meanwhile, Kai Akizuki, Saku's classmate in the store and member of the archaeology department, offers to compete with Saku for curry during field work on the shore of the first school district. On the day of the event, Kai makes a full-fledged curry, but Saku decides to compete with the secret taste of his sister's direct transmission!