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You're referring to "Putrid Object" relationships and romantic storylines, which seem to be related to anime and manga, particularly in the context of "rotten" or unhealthy relationships and romantic plotlines. F3 2021: Firmware Upgrade Tenda
In anime and manga, a "Putrid Object" or "Fūta" relationship refers to a romantic or erotic relationship between a male protagonist and an object, often an inanimate object that is anthropomorphized or a character with a non-human appearance.