Currently Airing Anime

Nisekoi
If the blonde is the main girl I'm not interested, not really into her type at all.

It's a harem, and there are like three possible girls with which he made that childhood promise with. I think like two of them have a pendant each, and the other remembers the promise which matches the flashback or something word for word. So it's STILL totally up in the air as to which girl's the right one (or maybe dude's memory got fragmented somehow and he actually did make a promise to all three).

 Spoiler

The first two girls, along with the male lead, were childhood friends, though none of them remember that there were three of them.