It looks like you’re referring to the Japanese adult visual novel / anime series (夫婦交換 ～戻れない夜～), often abbreviated with “th” possibly meaning “the” or a chapter number (e.g., “3rd” → “3th” → “th” typo). The title translates to “Couple Swap: The Night of No Return.”
Akane looked at Shinji. He looked away first. That’s when she knew — the marriage had already ended. They just hadn’t buried it yet.” **“They thought it was a game. Until they couldn’t stop playing. FUUFU KOUKAN – MODORENAI YORU No Return. No Regrets. No Innocence Left.”
“‘Just one night,’ Ryo said, smiling. ‘No strings. No guilt. Just… honesty.’
Since you asked for a complete text for it, I will provide a full synopsis, character set, plot structure, thematic summary, and a sample opening narrative in the style of the original work. Fuufu Koukan: Modorenai Yoru Alternate Title: Couple Swap – The Night of No Return Genre: Adult Drama / Psychological Erotica / Relationship Thriller Format: Visual Novel / Anime OVA (2 episodes) Complete Synopsis Two married couples — long-time friends — find their relationships strained by monotony, unmet desires, and emotional distance. One evening, after drinking together at a resort cabin, one husband proposes a reckless game: a temporary spouse swap for one night only. What starts as a drunken fantasy quickly becomes reality.
