This is when Natsuki will mention that the players have been spending way too much time with Yuri and her face will begin to glitch in black-colored pixels.
On day 3 of Act 2 when the players are done writing 2 poems with her, it will be time to share the third poem. When the players are in Act 2 of Doki Doki Literature Club Plus, they will witness Natsuki’s end where her neck will snap.