Seiichi Osabe, an ordinary only child in middle school, enjoys a typical life with friends, a crush, and caring parents. Yet, his mother's excessive protectiveness earns him the label of a mama's boy. Unfazed by her actions until a pivotal event, Seiichi begins to realize the peril in her suffocating love. Struggling to liberate himself, he unravels the startling truth that shatters his illusion of a mundane existence.