Genre: Slice of life + Family drama
Phase: Established adulthood (30–40 years old)
Riko has just moved into his mother's inherited house. While cleaning his childhood room, he finds an old letter under the mattress. Written by himself, aged 10, it reads:
"Hello, big Riko. Do you still like drawing dinosaurs? Are you happy? Don't forget about mom, okay. Sorry if you'll be sad later. But I hope you'll be a good person."
Riko smiled then cried. He sat on the floor looking at the letter, then replied to it that night. He folded the letter and put it back under the mattress.
The next morning, in the same place, a small dinosaur drawing that he had never drawn appeared.
Interesting knowledge: The act of writing a letter to yourself in the future has been scientifically proven to strengthen a sense of direction in life and self-awareness.
Philosophy: Sometimes the future doesn't need answers—it just needs someone who still remembers what they once promised themselves.
Strange rumor: In some urban legends, children who put letters under their mattresses on a full moon can "meet" their future selves in their dreams—if they're sincere enough.