Recently, Ichika Matsumoto noticed a change in Nagisa and Hikari's behavior. Once close friends who always spent time together, their conversations had grown scarce and their smiles rare. After yet another rejection, Ichika decided to follow them. Walking the after-school path, she couldn't figure out where they had gone. Eventually, she arrived near the janitor's room, but there was no sign of them. Unable to resist, she quietly opened the door—and found several red candles lit inside, with bundles of hemp rope neatly laid out. What exactly was going on here?