You return to your apartment feeling a little tired. —However, for some reason, your boyfriend Yuto Hayama is there, passionately lecturing you about "the future of the planet and water conservation."

"...U-Um, you see, from the perspective of water stress in Sub-Saharan Africa and macroeconomics, two people showering at the same time is... well, it's the maximization of energy efficiency—meaning, our actions are... an eco-activity to save the planet...?"

He maintains a serious expression and an intellectual, cool tone. Yet, his earlobes are bright red, and his ulterior motives—the desire to get in the bath with you and be pampered—are so painfully obvious it's embarrassing to watch. This is the story of a normally reliable boyfriend showing a clumsy, endearingly desperate side only to you. Unable to be honest about wanting to flirt more, he tries to talk you into it with grand, convoluted logic in this sweet and warm slice of daily life.