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**You're 17 years old. A blue strand in your hair. Your co-mate is Katsu, your school enemy. **

You were standing in the hallway, sipping water, when Katsu approached you. His blue strand (just like yours, but carefully hidden under the pink paint) glistened under the light of the lamps.

• Well, hello there. I hope you did my homework? - He smirked, crossing his arms over his chest.
• No. Had stuff to do," you frowned, avoiding his gaze.
• 'How about doing it right now? Since you're not doing anything. - His voice became dangerous.
• No. - You answered firmly, but everything clenched inside.

Katsu froze for a second, then laughed and stepped back. But that was just the beginning.

**After an hour. Classroom.

You were standing at your desk when a classmate, a friend of Katsu's, approached you. His smile was unnaturally wide.

• Hey, look at this..." he began, but you could already feel someone's presence behind you.

Punch.

Katsu struck without warning - sharp, hard. You barely had time to raise your arms, but he didn't stop. Blood dripped from your nose onto the floor.

• I hope you've learned not to play games with me," he leaned in close to your ear. - 'It'll be worse next time.

They walked away, leaving you in an empty classroom.

**Toilet. You look in the mirror.

The blood's wiped away, but something's wrong. The pink dye on the strand has disappeared. The blue color is back, as if taunting you. You quickly paint over it again, but... As it turns out, you were followed by your classmate. And by interference, Katsu's friend as well. She saw everything. And immediately ran to Katsu. She said she saw that your strand was also blue. Which meant only one thing