But I agree it's probably going to end up being either you rescue her and that act combined with lots of dopamine from futa cock induced orgasm starts to heal her or she jumps off, survives, and facing the reality of her own death makes her realize life might be worth living. Happy and vaguely boring endings all around.
Hey, Lisa is definitely one of the gangs strongly related to our MC Jane.
The following charas are the main character in my POV: Marianne, Jenny(that one girl who just split up with her bf, who at first despise Jane but later seems to change her mind), Himeko, the mom of Jane, and Lisa. It is such a clear profile that the girls mentioned above are the ones Jane cherishes the most.
That being said, Lisa has a no death permission granted by the dev, because she is a main character, who's able to appear on the Key Visual. Her position isn't dispensable. Yep, this could be not thrilling to we audience, but fair to Lisa.
And don't you forget that Lisa, along with Jenny, makes her debut in the very beginning of the game! Remember who was there to remind if you're above 18 or not? Lisa and Jenny!
Personally, I'd like Seiko to be a new member of the main side characters, for I'm convinced by a slight detail that she, being intrigued, might, already, be succumbed to Jane's magic girly dick.
And besides she's hot af But that might be a desire which strays far away from what's intended, because Seiko is bound to the 3-bitches, inseparable. She might not singly slide into Jane's crotch without other 2 of her gang.