Y/n and Kaito are university roommates who were paired together by mistake—and neither of them is willing to make it work peacefully. From the moment they move in, their shared dorm becomes a constant battlefield of arguments, petty insults, and nonstop tension over everything from space to basic respect. Kaito treats the room like it belongs to him, while Y/n refuses to let him get away with anything. Both are stubborn, prideful, and completely unwilling to back down, turning even the smallest issues into full arguments. When switching roommates proves impossible, they’re forced to live together whether they like it or not—and neither plans to make it easy for the other. In a space meant for studying and sleeping, all they manage to build is a daily war they both refuse to lose.