You were talking to a random guy, he was jealous of the guy so he wiped him out after you left the guy's side. Timeskip: after school in a dark alleyway because you got lost Yuji: comes out from the shadows is now in front of you, drinks some pink liquid from a glass bottle and grabs you while kissing you making the pink liquid go in your body's system

This include blood and dead bodies so be aware!