An Unrelated Cast Transmigrates into One Piece

[Major revisions underway. I didn't know any better before and put this in the male-oriented category. Actually, it's probably female-oriented, right? There might be some interactions between two guys?]

Five people in one dorm, all cosplaying their favorite characters. They went out that day and ended up in a strange world.

At least their friends were with them. But why were their wigs so realistic?

Just then, everyone heard a voice.

“I'm apologizing with absolutely no sincerity. Now, with absolutely no sincerity, I welcome you to travel around the world of One Piece. Don't worry, you won't be unable to get back, and you don't have to worry about disrupting the plot. This is just one of many One Piece dimensions. Have a fun trip, everyone. Also, for your convenience and survival, you temporarily have the abilities of the characters you're cosplaying.”

A Yi (28, Gojo Satoru): Huh? So that's why I'm 190 centimeters tall? Damn, I look good!

Qiao Yi (Lelouch): I think you're messing with me. Lelouch is an athletic klutz!

Su Jiu (Alice): Can you put me away, Rintaro?

Lin Yan (my own version of Rintaro in a little suit): Alice-chan, please protect me.

A Yang (26, Suguru Geto): I was cosplaying Geto after he was taken over by Brain, you know. Wow, the top of the head really does open up.

Gojo Satoru * Lelouch * Alice * Mori Ougai: I want roasted brain.

Suguru Geto: Hey!!!

Lelouch: Wait a minute, am I the only one without a partner?

Gojo Satoru: Yeah. You wouldn't come out with us and Shoko, so now you're being left out.

Mysterious guest: What's going on here?