Fatal Frame 2 is a curious choice for a remake on the Nintendo Wii since the original version appeared on the Playstation 2 (and later Xbox) so the graphical leap isn't what you would come to expect for a remake. The plot of the remake remains largely unchanged with the exception of the new endings introduced here.
This Wii version has six endings in total, including the one where you can opt to just save your own hide and leave the twin sister behind when she gets abducted at the last chapter. I have seen four of the six endings now and honestly, the original ending is the one that resonates most when I think of this game. It's the only ending I unlocked when I played the original version on the Playstation 2 and it's a fitting end to the story. I remember the original version forces you to play the game again in Hard mode in order to unlock the other endings. The developers have fixed this on the Wii remake, you don't have to play the game twice to experience the other endings - the ending you received is based on how well you play so you can actually reload from a save file near the end and get a different ending each time, assuming you know the criteria for locking that particular ending.
There is one ending where both sisters survives but Mio ends up blind because of the events but so far, each ending I got is pretty tragic and dark (meaning either one or both sisters dies).