Recently, Sebestian discovered that his mate seems to have the habit of biting her nails.

Because this kind of behavior happened occasionally, he didn't pay much attention to it at first, but as the time with Allen got longer, he found that Allen would bite her nails more and more often.

Due to his previous friendship with someone who used to do the same things, Sebestian, who is good at observing, noticed that Allen's nail-biting behavior would occur about once a week, and every ...