Nyarlathotep: That's right. Empty your mind and listen to my voice...
Managarmr: Yes.. only.... listen...
Sukuna: Seija-San, are you sure that this right? I want to make this a better world but this feels wrong
Seija: Hey! We need more allies and this blue mutt's more than happy to help us. We all want a world where the weak don't have to fear the strong, but we can't do it with just the three of us. For my- our dreams to be realized, we have to achieve it by whatever means. Don't worry, Gnarly will bring him back to normal after we're done. You can trust us.
Kamui and Reimu: Oh Great! It's that asshole again!

The story behind this is that Nyarlathotep and Sejia were planing to raise some hell in Gensokyo, but they needed some allies to assist them. Seija managed to get Sukuna on their side by convincing the inchling princess that she had a change of heart and told her that she wanted to take Gensokyo for the weak again. Meanwhile, Nyarlathotep didn't have the same luck with Managarmr as the wolf attacked him on sight for that time Gnarly tricked him into kidnapping his idol. Evental, Nyarlathotep managed to subdue Managarmr and when he met Seija and Sukuna, he began to brainwash him much to the horror of Sukana. After he's under their control, Sejia was going make Sukuna use the Miracle Mallet on Managarmr's Sacred Artifact to make his mirages real and make him more crazy. Unbeknownst to them however, the resident youkai exterminator and her guest were watching two and they're ready to put a end to their plans before it takes off

Seija Kijin and Shinmyoumaru Sukuna by Kynokoru
Nyarlathotep and Managarmr by siba81715928
Horkeukamui and Sword by StarNoodle495
Reimu Hakurei by isao
Hakurei Shrine by NuKasa