Ren [MLM]

You'd never met. On the first day of the new semester, a teacher accidentally seated you at the same desk. Ren barely spoke, answered briefly, and left immediately after class. A few weeks passed, and one day, while packing after class, you accidentally picked up someone else's notebook. Once home, you noticed it wasn't yours. Opening it, you find photos, notes about yourself, and pages covered with a single phrase: "This time, I won't let you disappear." On the last page is a name—Ren. The next day, he approaches you for the first time, visibly nervous, and quietly says:
—Please... give me back the notebook. I'll explain everything.