And Tonight, Again - Episode 12

A gruesome murder has occurred in the mansion, leaving only two witnesses. The killer is skilled at concealing their appearance, leaving the Sheriff with virtually no useful information. He’ll have to solve this mystery on his own, using his wits and the clues scattered throughout the location.
Along the way, fate will lead the Sheriff to various places, each adding more arguments to the case. Furthermore, everyone has their own opinion about what happened.
The Sheriff doesn’t care about any of it. He’s not interested in this investigation. But a little bonus, in the form of a large sum of money, compels him to take action. Of course, the girls will never leave him in peace.

Once upon a time, in a topsy-turvy world…
In the beginning, you find yourself lost within a world of utter darkness. Your memories are gone; even your name is a mystery.
But just when the bitter loneliness threatens to break your spirit, you meet Alice—a blond-haired, blue-eyed young man who promptly christens you "Arisu."
Like you, Alice cannot remember anything beyond his own name. Ignoring his protests, you drag him along with you through the darkness… until you happen upon a massive mirror made of crystal.
You stumble through the glass and into the Looking-Glass World, an antiquated fairytale dreamscape that feels oddly familiar…
There, amid a colorful cast of gender-swapped fairytale characters, you take on the role of the heroine and join them in their twisted tales.

It's recently released in Steam, last November 28, 2019.

The protagonist, Artel, and her husband Kaale are a newlywed couple.
The two of them begin an investigation of a dungeon located in a secluded mansion as part of a request they accepted.
One day, while progressing through the investigation, the client tempts Artel by saying, “There’s an easier way to explore the dungeon.”
When she listens to the method, an unfamiliar “mysterious pattern” suddenly appears on her abdomen.
Though the pattern seems to be deeply affecting her mind, Artel continues the exploration in order to complete the request…

This is a story told by Shinji about the tree on a hill that unites people forever upon making a confession.