The story revolves around a 37-year-old man who, after a strange encounter, finds himself transported back in time to his 11-year-old self. However, this is not the only twist – he retains the memories and experiences of his past life. This reincarnation or regression, depending on one's perspective, sets him on a journey to relive his childhood with a newfound sense of awareness and purpose.

The episode ends on a hopeful note, with Shinji looking forward to spending more time with Natsumi and discovering the joys of being an uncle.

That’s the thesis of Episode 1:

The episode begins with the protagonist, Shinji, a 30-year-old office worker, going about his daily routine. He seems to be stuck in a rut, with no excitement or purpose in his life. However, his world is turned upside down when his sister, Yuna, announces that she's pregnant. This news makes Shinji an uncle, and he's forced to confront the reality of growing up.

Tanaka led Kaito to a small room in the back, filled with what looked like futuristic gadgets.