On their first hot spring trip, Koshi and Rimi are completely immersed in a naughty mood, dressed in yukatas unlike their usual attire. On the futons spread out in the traditional Japanese room, they immediately lie down and start cuddling. Koshi can't take his eyes off Rimi's fair skin peeking through her loosened yukata, his excitement growing uncontrollable. Though more shy than usual, Rimi becomes increasingly passionate, captivating Koshi's heart as he gradually teases her so intensely it feels like her hips might collapse. The natural rise in romantic tension deepens their relationship even further.