My "girlfriend" and I live through one day.

There was a girl whose personality changed every day. Her daily memories were continuous, but her personality was completely different. The personality that lived that day would "die" when she went to sleep. "She" tried to hide it and blend seamlessly into her daily life. By chance, I found out about it――. "I'll give the best day of your life to every single one of your personalities." Now, let's begin another first and last day. ※This work is also posted on "Hamerun."