Basically, knock her down and never ever give her a chance to attack... ever.
Context for those don't play this:
K-Sha's guns do Massive Damage™, and she WILL wipe your party out in seconds if you're not close to her level. She is the only boss out of the 4 members of the Gold Third (that you need to fight back-to-back) who is pretty much OP as hell.
Watch video Neptunia Game Maker R:Evolution - Defeating K-Sha while underleveled(ish) online without registration, duration hours minute second in high quality. This video was added by user Excal! 01 September 2024, don't forget to share it with your friends and acquaintances, it has been viewed on our site 103 once and liked it 2 people.