The Correct 5 have flown to Hawaii, but without Haruto the birthday boy, there’s no reason to celebrate. And Airi decided to stay behind at summer school, even though it was her idea to go to Hawaii in the first place. Supposedly, so she could keep all the students in line. Or so she says… And when Airi goes to visit Oto, she finds her literally on top of Haruto!
— Description from Comic Vine community (comicvine.gamespot.com).