Imai Daisuke

"Did you know? Even I get a turn to make my move." Temp worker Rino Amano, 27 years old, used to have a lover. His name was Haruo Higashiyama and he worked full-time at the same company as the manager of the planning department. He was 32 years old, married, and had a two-year-old daughter. While 99% of her knew that this was an unforgivable love that would never amount to anything, the other 1% was clutching her phone, spending her days waiting for him to reach out. One day he suddenly demands to break it off, throwing the feelings she had for him in the trash. This devastating blow leaves Rino distraught. Even at work she is unable to suppress her feelings, and she searches for an empty room to hide her tears. In doing so she catches Haruo secretly making out with another coworker much younger than herself. At that moment something inside her breaks and awakens something inside. English Translation: MangaPlaza

From manga-sanctuary : Are you certain nobody steps into your home while you're out ? Have you ever noticed small changes, when you come back home at the end of the day ? A cushion slightly moved on the sofa, a juice bottle a little less filled up than when you put it in the fridge in the morning, a shampoo bottle you were sure to have closed that you found open ? You noticed, then you went on to your business, because after all it's probably your memory playing you tricks, isn't it ? For Yoko, it's real. Ordinary at first sight, this 21 year old girl has vanished to escape from her former life. We don't see her, but she's here, just under our nose : she lives at our homes during our absence, going from one flat to another depending on her needs and whims. If this new existence is at first carefree and exciting, Yoko will soon know better. She thought she's the only one like this, she's going to discover a parallel society where violence is ubiquitous. Clandestines, criminals on the run or mere citizens who turned their back on society for more or less honourable reasons, the leeches are fighting over our homes, calling them nests ; they are fighting in bloody wars for territory and lead vendettas that more often than not end up in slaughter. Note: Series is complete in Japan (5 volumes long). It's got a sequel series titled "Hiru 2". It's also officially licensed in French: https://www.casterman.com/Bande-dessinee/Catalogue/sakka-sangsues/sangsues-1

Part of the 1 volume anthology based on ghost stories in the mountains, Yama Kaidan.