Muscle maniac Kaho Hibi and her upperclassman from the basketball team, Natsume-sempai, have recently become "muscle buddies." They make plans to go to the summer festival together, but on the way over, Hibi runs into none other than Natsume's childhood friend, Ikkei! Ikkei acts like he wants nothing to do with Hibi, but lately, she's been getting some mixed messages... And Ikkei's not the only one deepening his relationship with Hibi! What will happen when Hibi and Natsume take things further? How will this summer festival love triangle play out?