Nothing interesting in happening in Makoto Ozaki's first year of high school. His life is a series of quiet humiliations: low-grade bullies, unreliable friends, and the constant frustration of his adolescent lust. But one night, a pale, thin girl knocks him to the ground in an alley and offers him a choice.

Now everything is different. Daylight is searingly bright. Food tastes awful. And worse than anything is the terrible, consuming thirst. The tiny shames of his old life have been replaced by two towering horrors: the truth of what will slake his awful craving, and high school itself.