High school girl Ryōka receives a message from her mother. Her apartment building has suddenly become an enclosed space. She must face off against a mysterious, unidentified lifeform known only as "X" to escape and return to her family. (Source: Anime News Network)

https://www.cmoa.jp/title/352638/

How many days have passed now? It’s as if I’ve been soaking in hot water this whole time—. Best-selling author of the social media era, Moegara × Tokushige Kawakatsu, the acclaimed manga artist selected as No. 1 in “Kono Manga wo Yome! 2025” An unprecedented collaboration gives birth to an unparalleled fantasy tale!! When you make the blood in your entire body boil in scalding hot water, things that should be invisible become visible—. Kazuo Kato lives in Tokyo as a writer. Not only did the mentor who had taken him under his wing die in an accident three weeks ago, but recently, the girlfriend he’d been living with also left him. As he worked himself to the bone and led a desolate life, he gradually began to see strange visions. One day, a friend who sensed something was wrong came to visit, and Kazuo was finally swallowed up by the hallucinations—only to find himself at the inn in Yufuin that had belonged to his mentor. Is this a dream, or is it reality? What bizarre fate awaits Kazuo? (Source: Gunzou, translated)