Title: Metro
Mizuki spends his days under the watchful and paranoid eyes of his mother. It was of no fault of his own that he is monitored so carefully, but it is instead due to his father's infidelity. Because his father ended up having a scandalous affair and left both Mizuki and his mother behind, Mizuki's mother now views everything sexual as evil. To prevent her son from following the same path as his father, she makes him write out every hour of his day, monitors the media he consumes, and controls every aspect of his life that she can so he never encounters anything she deems as immoral.
This causes Mizuki's life to become rather hollow, especially since, due to an illness, he could not graduate high school and is forced to attend his final year again as somewhat of a social pariah among the strangers in his class. The only spark in his life is the few times he rides the metro. There, on the train, a faceless man assaults him. For someone else, this would be traumatic and horrific, and though it does scare Mizuki, he finds it thrilling and the only intimate connection he's ever had with another person.
This happens nearly every day like clockwork, with the man touching Mizuki for a while only to disappear without a word, until one day, while touching Mizuki, the man tells Mizuki that if he gets off the train with him, he'll give Mizuki more. Having been isolated and sheltered for so long, Mizuki finds himself unable to refuse this offer. But is what he finds on the other side worth risking his simple and routine life for?