Staffer Retro

Here is an excerpt from Staffer Retro's description on Steam:

[Staffer Retro] is a detective adventure that explores past events related to supernatural powers.

At the heart of the Staffer series lies mana, the phenomenon that binds each story together. Join Verita on her journey into this mana's past.

The game will clock in at around thirty hours, totaling six episodes, each with endings that split depending on the results of the player's deductions.

Each player will travel alongside protagonist Verita Retro as she crafts her own story using logic and choices. Along the way, you'll find documents relating to supernatural abilities and maps with all sorts of clues left behind. Combine information from the documents in order to get closer to the truth buried in the past.

Collect information through dialogue and exploration, changing the course of the story with logical deductions along the way.