It was a peculiar arrangement, really. My mother (haha) had this unusual friendship with an elderly man, whom the kids affectionately referred to as "Ojisan" (uncle). What made it even more unusual was that he decided to spend a whole year (1 nenkan) helping out around the house, particularly focusing on the children's room (kodomobeya).
If you're into deep-dive visual novels that explore unconventional and "secret" family dynamics, you've likely come across . 🏠🤫 haha to kodomobeya ojisan no 1 nenkan no nari full