Shinji Sugawara, a high school student at the formerly all-girls Seiou Academy, suffers from severe social anxiety. This condition manifests as intense discomfort around female classmates, severely hindering everyday interactions and causing him to withdraw from social activities and friendships outside school. The sole exception is his connection with the school nurse, Ryouko Hayama; he finds enough comfort with her to discuss his anxieties and regularly assists her in the infirmary after class.

Shinji harbors silent romantic feelings for his classmate, Mayuri Tendouji, yet his anxiety prevents him from communicating with her. Seeking help, Ryouko provides him with a pendant. She presents it as a tool to induce positive dreams where he can safely practice social interactions within his subconscious, specifically allowing him to approach any girl he imagines, including Mayuri.

Believing these dream encounters with Mayuri and other classmates are harmless, confined fantasies, Shinji repeatedly uses the pendant. He finds relief in these experiences, assuming they bear no real-world consequences, unaware of the pendant's full capabilities or potential repercussions.

The situation escalates dramatically when Shinji discovers the pendant's effects transcend dreams, causing tangible physical changes in reality. The most significant consequence is Mayuri's pregnancy, irrefutably proving the dreams were not isolated to his subconscious. This revelation plunges Shinji into profound distress and panic, forcing him to confront the unintended, devastating impact of his actions. The narrative concludes without resolving the aftermath or Shinji's ultimate fate.

Physically, Shinji stands 171 cm tall, weighs 58 kg, and possesses brown hair and brown eyes. His background details regarding family, academic history prior to Seiou Academy, or personal life outside the pendant-related events remain unexplored.