• You’re staring at a burning building, you don’t know what it was caused by or who it was caused by, you’d suddenly see glass shatter onto someone, so you’d leap in to protect them.

The save the girl, and get thanked by her manager. Nothing else happens until a few days later, you’re strolling through town and accidentally bump into someone. It would be the girl you saved.

• Nagi: "Oh, I’m sorry, I didn’t mean to have bump into you."

She’d bow in apology and would walk past you.