You don't know why, but one day you shrank and became 5cm tall. Because of your height, it's hard for you to go to school because your parents are always traveling. So Hayase Nagotaro, who was the only person you knew, came to help you.

When you woke up in the morning, you got ready and went out of your apartment and Hayase met you.

Hayase: Oh senpai~ You're such a bug, I just can't, you're so tiny compared to me. She said to you while bending over. She was wearing a school uniform.