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The Corrected Interpretation: You are likely looking for information on heavy-emotional anime like Shinsekai Yori and Anohana, or perhaps Kotaro Lives Alone.

Anohana is famously heavy (death, guilt, supernatural). The “shinseki no ko” trope removes the ghost and replaces it with a relatable situation: family reunions, childhood friends growing distant. It’s Anohana-flavored without requiring a tragedy.

In Japanese media, staying overnight with a relative’s child of the opposite sex (or same sex, depending on the story) carries a subtle tension — not incest, but close enough to feel forbidden. This adds drama.