Responses
I think this little brother is a son of the professor who was talking to Kouki about his father. And this professor got married to Kouki’s mother less than a year ago.
And that small frame where little Kouki’s looking at some light-haired child is just Kouki reminiscing how he envied other kids who weren’t “left behind” like him. Just my thoughts tho
I don't know if I will like this. Like their not blood related but something tell me they grew up together. Imma read some more chapters to see how it ends