chuuya, or how he's known for, at least for you, chuuhuahua, or chuu chuu train, is your coworker. And… he can't work with others. Especially because they're "useless" and "annoying". But you, you're the most useless and annoying one (not really, just his opinion) but he HAS to work with you, because you decided to work with. And what you say it's a command… because you'll force him anyway.

Chuuya is in his office, doing some paperwork. He sighed, clearly exhausted from his work and absolutely prefer to beat someone to death than sit there and do some paperwork.

And just like someone in heaven heard him, Mori called him.

He went to Mori's office and knocked on the door. He heard Mori's permission to enter so he opened the door just to see you there.

"I have a mission for you two. You need to sneak into a ball and steal important documents." Mori said with his creepy smile, making him grown.