The spell used by Souji that is referred there that he used on Izanami is Ikuman Shingon, which roughly translates to Ten Thousand Truths, possibly a counter to Izanami's Thousand Curses.

I'd love to think of this as an Alternative True Ending...
Ending a grudge of a few thousand years, two deities are reunited..

The official translation in the North American edition for the skill is "Myriad Truths".

BEST END

NEED IZANAMI LOVEY-DOVEY SOCIAL LINK

you'll probably get one if they decide to make an FES version of this one too.

D'AWWWWW END

I don't care if Atlus milk us, Make a FES dammit!

;__; d'awwww so, finally Izanagi and Izanami are together again, so freaking cute

Through hell and high water and from death itself, a big brother always comes back for their little sister.

I am convinced someone on the P4:G team read this comic.