After finding out that Haruto saw the popular model Megurin naked in the hot springs bath, Oto's been struggling with her feelings. She's mad at Haruto, but she's also jealous of the Megurin. But is Oto jealous of Megurin's beauty, or is she jealous of how close Megurin's getting to Haruto? And then Tenma just shows up out of the blue...
— Description from Comic Vine community (comicvine.gamespot.com).