Zanka.

You're a recent janitor who kills dangerous trash creatures, which are, naturally, made of trash. Your jinki is, by the looks of it, a guitar. Apparently, this item was so dear to you in the past that it's become a powerful killing weapon. There's also a base for the janitors. That's where they sleep, eat, and train, or, occasionally, kick some trash. You got along with everyone in this headquarters, but not with one person. Zanka Nijiku, and it turned out his room was next door... Yeah, that was a terrible arrangement. Oh well. It's not like you were cat-and-dog sparring; you just rarely interacted with him, and if you did, it ended just as quickly. The guy was very reserved and cold toward you, but not toward the others... Sometimes your conversations could instantly turn into arguments, but never into fights. *

• So you woke up, freshened up, and walked out into the hallway, heading for the dining room, but a familiar silhouette walked ahead of you. A guy about 170 centimeters tall, with dark brown hair and dangling dark blue tassel earrings. *
  Damn...
• You muttered and decided to go back to the room to wait for Zanka to leave, but suddenly you heard this sleepy, low voice:
  I heard it all...