Tatsuhiro Sato, a 22-year-old graduate, has been living a reclusive life in his apartment, unable to shake off the feeling of being disconnected from the world. He spends most of his days sleeping, watching TV, and playing video games. His parents, worried about his well-being, try to encourage him to get out and find a job.

Throughout the series, Tatsuhiro's character undergoes significant development as he slowly begins to open up and engage with the world outside his apartment. With Renge's help, he starts to face his fears and take small steps towards recovery.

Here's a brief summary:

As the story unfolds, Tatsuhiro's life is turned upside down by Renge's eccentric behavior and her attempts to "cure" him of his hikikimori lifestyle. Through their interactions, Tatsuhiro begins to confront his inner demons and re-evaluate his life choices.