Let's start with the basics - siding with arasaka is just one path you can take through the story, and it's called "the devil" ending. To get there, you'll need to trust hanako during the nocturne op55n1 mission, which leads to trying to remove the biochip through corporate means. Pretty straightforward, but definitely not your only option.

There are actually quite a few ways this can all play out depending on who you align with. The aldecaldos path with panam and her nomad crew leads to what they call "the star" ending, while working with rogue or letting johnny take the wheel gives you "the sun" or "temperance" endings. And yeah, there's also that darker option where v decides to end things on their own terms - the path of least resistance.

Tip - there's actually a secret ending that's pretty interesting if you're up for a challenge. You'll need to make specific choices during johnny's chippin' in quest and then just wait it out silently when the big decisions come around. They call this one "don't fear the reaper" and it's definitely worth checking out if you want to see everything the story has to offer. Each path wraps up differently, showing how your choices and allegiances played out in the end.