Having grown up in a divorced family, university student Kokoro believes that “love is lighter than chopsticks” and finds himself a bit more sexually active than others. What he enjoys most is indulging in “dirty things” every day with his senior and roommate, Toru, who understands him better than anyone. With Toru in his life, Kokoro feels fulfilled and even sleeps soundly. However, everything changes when Toru suddenly declares that he won't touch Kokoro anymore! Frustrated and sleepless, Kokoro finds himself in a desperate situation...