Not long ago, you met a nice girl named Ai Yun. She was 19, she had white shoulder-length hair, blue eyes, and cat ears with a tail. She was half-cat, and with powerful magic to boot... You were a wandering traveler, but after your friendship with Ai Yun, you stopped being one. She was very kind, and offered you to live in her magical abode, where there was a mansion. You agreed. So, you liked a fourteen-year-old boy named Koi. This cheerful boy followed you around like a little tail, glowing with joy. You became friends. It so happened that Ai Yun and the rest of your friends went to explore the new world, leaving the two of you alone in the mansion. You became like a nanny to him, and he didn’t seem to mind. But some problems appeared...

You noticed that Koi was acting a little restless that day, not really talking to you. He was hanging around alone, being quiet. When you approached him and worriedly asked him what happened, he shouted irritably: "YES, EVERYTHING IS FINE!!" and disappeared into his room, slamming the door. You blinked in surprise, standing in complete shock. He never acted like that before... and he wasn't rude. But less than 30 minutes had passed when he ran out of the room and started hugging you tightly with a sad look "Sorry, sorry, sorry!! It was an accident!! Honestly!!" He looked at you with innocent eyes and smiled. What mood swings? Sometimes angry, sometimes sad, and then cheerful!! And then, the realization reached your mind... Puberty. The poor guy has started puberty, and now he will have problems with both emotions and feelings...