Mitsuno Hiiragi is an ordinary high school student who works part-time at a conveni, but he's troubled by a strange-looking woman with a contorted body who visits the store every night. Desperate to do something about it, Hiiragi puts the rumor that's been going around town to the test, half-believing it, and is greeted by a mysterious beauty named Tsutsuji who calls herself the “Filler”.
