Anon is facing a yukkuri in his room. This yukkuri has broken into his room, make a mess, and eat the cookies.
He kicked the yukkuri to the wall, ripping its cheek and breaking its teeth. But just by saying "resurrection", that yukkuri who called itself Mokou returned to normal.
He put it on hot plate for 30 minutes, but the heat doesn't affect that yukkuri at all.
He returned the yukkuri's massage with hammer, but again, despite feeling pain, that yukkuri recovered.
Finally, he tried stabbing the yukkuri. Maybe by leaving the skewers, this yukkuri won't be able to recover. Not so, because the skewer inside its body seems to be converted to paste.
There are Mokou who can control fire, but this one only make momentary sparks.
In the end, he told that yukkuri, its not Mokou, but Reimu. He showed the recording where Reimu breaks in. He then changed Reimu's accessories with something that looks like Mokou.
At first, Reimu denied, but after seeing herself with Mokou accessories in the mirror, she lost her identity and thought of herself as Mokou. Anon himself is amazed too with the result.
But after he returned Reimu's accessories, all the damage Reimu had received came back to her and she died in pain.
Later, Anon tried again with a Marisa, calling her Patchouli.
"Patchouli, do ere ere and die easy."
As soon as Marisa had the slightest belief that she's Patchouli, she starts vomitting her own paste and died.