Since the term "cap" can mean manga chapters, check:
Chapter 2 deepens the emotional intimacy. Haruki gets a part-time job at the local aquarium—Akari’s favorite place as a child. They begin walking home together every evening. shounen ga otona ni natta natsu cap 1 2 3 sub full
The series follows Haruto, a 17‑year‑old high‑schooler who, after a bizarre summer‑night incident (a meteor shower, a forgotten shrine ritual, and a cryptic “wish” he makes), wakes up the next day with a “grown‑up” version of himself living a parallel life. The adult Haruto appears only to him, offering blunt, world‑weary advice while still being bound to Haruto’s teenage body and school life. Since the term "cap" can mean manga chapters,
The concept feels like a spiritual cousin to Your Name (the body‑swap angle) and ReLIFE (the “adult in teenage body” motif), but it leans more toward realistic emotional growth than supernatural romance. The concept feels like a spiritual cousin to