Rascal Does Not Dream of Randoseru Girl (light novel) — Hajime Kamoshida

Home is where the family is.
March has arrived, meaning there's only one month left in the third term. Mai's graduation has come and gone. This might be a time for change, but that isn't nearly enough to explain why Sakuta meets a little girl who looks just like Mai did when she was a child actress. Before he can even begin to unravel this fresh mystery, his father calls. Their family hasn't lived together since Kaede was bullied. Two long years later, their mother says she wants to see her daughter. What's changed, and what's stayed the same? There's only one way to find out...