Reika and Iwakutsuki flowers/plants.
'Death' is written all over the chalkboard... Except for one place.
This room is also appears in Reika's part, just with different wall color and posters.
This event looks familiar...
After triggering the flying box event, this box will appear. (Originally it's not there and it's the same box that leads to this effect)
After seeing this event you will get caught by a chaser.