Losing All That Was Gained! The Garden Of Hope - S1.E12

With the spirits gone, it’s only a formality that the student council disbands. Haruto is given a sealed box from the chairman’s office, but somehow he gets warnings from the ghost chairman not to open the box. Wait, wasn’t the chairman exorcised? Asahina and Kazumi try to trick the man in black into unsealing the box, but the chairman continues to warn Haruto. The council learns of the true nature of the box when it is accidentally unleashed.