Katsuragi Bakugo had been captured and experimented on with Orphnoch DNA, but got rescued by none other than Tsukasa Kadoya himself, who gave him the Faiz Gear and told him to join Unity Academy in order to fight a bigger threat.
(After having a deal with both Lucifer and Acheron, Kagerou and Ruan Mei have the latter's help to fight Rias Gremory.)
(Next morning, Rias's Peerage, Riser, and Sirzechs' followers (Souji, MacGregor, Surtr Second, Bahamut, Enku and Beowulf) launch an attack on Hazbin Hotel as only Kagerou and Acheron are there to face them.)
Souji
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MacGregor
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Surtr Second
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Bahamut
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Beowulf
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Sirzechs' Followers: Looks like we hit the jackpot.
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Rias: Very well, you know what to do!
(They nod as they charge at the two as Acheron charges back while Kagerou prepares to transform.)
STANDING BY!
Kagerou: Henshin!
COMPLETE!
(Kagerou becomes Kamen Rider Muez, and prepares to face them as well, but somehow he fights like he got drugged.)
Muez: RIDER CABBAGE KICK!
(Muez kicks Souji, before seeing MacGregor chargin at him.)
Muez: RIDER DONUT PUNCH!
(Muez punches MacGregor in the gut before unlocking the Muez Edge.)
MUEZ EDGE UNLOCK!
(As Muez grabs the daggers, he prepares to slash Surtr.)
Muez: RIDER SPAGHETTI SLASH!
(As Muez keeps fighting, the Unity Students and other guests of Hazbin Hotel wake up and see Muez fighting with weird movies.)
Katsuragi: Is that...
Marin: Professor?
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Chloe: I know he's our professor, but the way he's fighting. This isn't him. This is RIDICULOUS!
(Then they hear a laughter as they turn to Ruan Mei laughing while filming Muez fighting with extremely ridiculous moves.)
Students: Ruan Mei?
Ruan Mei: Oh, that's so funny.
(Muez keeps fighting and clowning.)
Muez: Cut it in half, I cut the sorrow in half. I cut the silhouette that I've been carried with me.
(Everyone gets dumbfounded by Muez's weird fighting, but in the end, he and Acheron manage to defeat the invaders, and the latter kills Rias Gremory in cold blood, making her peerage shocked. They teleport back to Union Academy.)
Acheron: Tch! Cowards. (looks at Rias' dead body) I got my closure at last.
(Muez reverts back to normal as the students start laughing at him, and so does Ruan Mei, much to his confusion.)
