Am I doing something wrong, or are there a ridiculously high amount of checks required to rescue Cassie, even after recruiting Fawn and Arlene? Even the initial STR check is only 38% at STR 14 (The seduce option is greyed out for some reason). It seems like the only way to make it through without just reloading the save over and over until I pass every check is to spend ages going back and forth between the gym and the condo to train stats, sleep, train, sleep, repeat. This is a fun game and I've been enjoying it so far but that seems excessive. Similarly, the Infected Abomination's health seems far too high for me to beat it without using a ton of stamina drinks at the right times, presuming you are meant to defeat it? Idk, maybe I'm missing something or maybe the parts of the game that require high stats just aren't for me, at least not yet. Other than that though, I've for sure been enjoying the game so far and I'm excited to see where it goes
Update: I realised you can ask Lin Lin and Sammy for help to get an extra +40% on the skill checks, so turns out no, you don't have to grind! At least for rescuing Cassie. Still no clue about the Abomination. I've tried going back to the base and defeating the core, but it won't let me near, so I assume that's not the way either.
Abomination's a challenging battle, but it's doable. There is better food in the game than stamina drinks (e.g. Your Milk then Angel Milk, or just Fish Soup (Good!)), make sure you have good weapons equipped, get the usual set of stat buffs from town, and be sure to Guard for the big attack rather than outhealing. I was able to beat it (18 str, 11 res post-buffs) without using any healing items and with really bad strategy, so if you have a few you should be able to do it when weaker than that.