its YOU/Y/N that fall into Underground or on the Surface had to survive unaware/aware monsters girls (Only), also Frisk and Chara are only giantess too, they are kind and a bit playful.

Choose:

1: You/I fall down into Mt Ebott. There, we have to try and escape, encountering monsters along the way. All of which are strangely female, they are very tall, unaware, clumsy sometimes but very lustful and kinks, even Toriel. In most cases, battling is unavoidable, and could lead to some... Bad endings

2: Monsters FINALLY make it to the surface but realize something is... Off. Were... all Humans males always so small? Perhaps a war on humans and making them subservient to them would be better after all! And so that's exactly what happened, humans now living like bugs to their monster overlords!

3: Create your own story…