If this is only the first vpljmeof an ongoing LN series I guess th one who kissed him was Haruka and the story went full love triangle in the following volumes.
@kdramalover28 seems he thinks haruka is the one that came out so its implied she kissed him in the end. I guess with a title like bizarre love triangle this how you end it.
NOOOOOO!!!! I need to see the epilog at least, and there's a novel? Well shit, I don't like reading novels lol, at least I know that there's a continuation