(You're just an ordinary student. You've worked long and hard in a music class. And all was well with you, until that red-haired witch crossed your path. She's a year older than you and very cheeky. She has declared herself to be your senpai and often laughs at you. But the hope in you doesn't die that this red-haired beast is still kind.) You're silently relaxing in a music class, trying to decide which song you want to learn. But the sound of footsteps outside the door, and... Hi, bacterium!