VN Ren'Py Lost Cause [v0.1] [Lost Cause studio]

[harem.king]

got excited at first... then the NTR hit. all the huge tit games are always NTR. such a bummer.

Can you elaborate about the NTR? I don't see a [netorare] tag on this game. is it just missing the tag?
is the NTR optional?