Ghost Hunter Vena 1.07

One day, Leen comes to school and makes the claim to her friends. Vena and Rixa that she saw a ghost through a window in the old, abandoned Sanulier Mansion. Rixa mocks her and makes a bet: all three will go to the mansion that night and investigate. If they find any evidence of ghosts, then disbelievers, Rixa and Vena will show up to school the next day. Naked, while if they fail to find any evidence then Leen will have to do the same.
Their teacher Sui, known to her students as 'Miss', interrupts, on the bet on Leen's side and joining them at the mansion that night. After some exposition, the four are separated after a mysterious tremor. Vena encounters a supernatural being in the form of a strange glove called 'Hand' (he is not actually called that, Vena starts calling him that partway through the game, but I'm using it to refer to him the man who has been kept in the mansion, has been depleted to resolve the imbalance. He and Vena make a deal, that Vena will become his host and put him to rest.