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Masumi Kubota is a university student with delusions of grandeur. On his twentieth birthday, he tries drinking for the first time, because he thinks that drinking strong alcohol is degenerate and cool. But he's gone after half a can and blacks out! His neighbor, Mio, who goes to the same university as him, takes him in. Mio doesn't get drunk from alcohol, but he does get drunk from certain physical activities. Masumi is so jealous of his ability to stay sober that he ends up sleeping with him...!? Mio, the mysterious, alcohol-immune prodigy in bed, decides to help Masumi, the delusional lightweight who turns really cute when he's drunk. Will their drinking practice that leads to consensual drunken encounters develop into love!?