Responses
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Seems like in 2010 Itoi Nozo released manga called "Koi No Hi" (Day of love): http://ru.myfigurecollection.net/item/132110
I liked chapter 8 and the poster art, hopefully someone will scanlate "Koi No Hi" someday...
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Oh, another link: https://www.mangaupdates.com/series.html?id=61898
The perfect bittersweet, psychological, twisted ending. She went back. Voluntarily. And cooked dinner! AWWWWWW