If you want more anime with “relative’s child overnight stay” scenes, use these Japanese search terms (copy‑paste into Google or anime DBs):
After careful analysis:
Mika grabbed Haru’s headphones from the coffee table. They were still connected to his portable media player. On it was a file: Shinseki_no_Ko_Ep01_JAP_Audio_NoDub.flac . She shoved the headphones on, pressed play, and the raw Japanese track flooded her ears—clean, natural, untainted. shinseki no ko to o tomari dakara dub free