Basically Tsukasa always had this bipolar thing, infront of he was his canon star self but alone he was like Mafuyu. He didn't know what he wanted to do, he just remembers wanting to become a star for Saki so he's doing that but he's just is empty. Whenever he's in that other personality he is very serious no nonsense person. But Mafuyu has something similar but not exact thing, whenever she's OWN she is more sadistic, she smiles and laughs whenever bad things happen and is just normally smiling in general. One day Tsukasa stumbles upon OWN's first song and just related with it, he finds himself listening to it all the time but he cant put it in his playlist because it's public and everyone will see it so he makes another playlist an he finds himself just putting sad songs in it. Eventually he reached out to Mafuyu, they both started to run OWN, they voice chat but dont know eachother in real life. Mafuyu is known as Yuki, a sadistic woman is Tsukasa's opinion, Tsukasa is known as Dare demonai and like KAITO in Mafuyu's opinion. Wxs doesn't know anything about it because Tsukasa is great at hiding stuff and N25 know Mafuyu is behind OWN but dont know her alter ego or there's another person behind it too but Nene has heard of OWN before. Tsukasa and Mafuyu start getting distant from their groups to talk to eachother more and at first no one noticed but it's starting to become more obvious now

One day Tsukasa was on a call backstage while he was waiting for his performance to come up, normally he'd be talking to Nene, Rui and Emu and he didnt so they noticed this

Rui: "Tsukasa has been distant with us recently hasnt he..?" Emu: "Yeah! Normally he's always talking to us but he's been on a call tho!" Nene: "Wonder who it is that has him so interested..."