As I said, they're easy to dodge if you don't use slow moves so that you can dodge or run out of stuff when it hits. Basically, sheath your weapon, wait for him to do some lightning thing, hit him once, sheathe your weapon. He only has a few lightning attacks, one line in front of him(so never be in front of him, it's also multhit so if you block you need guard 3 and not the counter block on lance), one that does like 6hits in a row around him in a circle, this can be dodged by either getting close to him or by moving between the lightning, they hit at equal distance from each other in a circle around kirin, and then there's the big lightning on top of him which you definitely want to dodge but that has poor range. He also does the lines but these are simple enough.
All the attacks have some serious delay before the lightning hits and before he starts another move, so you can easily get a single hit in, as long as it isn't a super slow move like SAED or true slash charge or whatever. When he enrages, you can simply not attack him for ~2mins until he's done, just focus on dodging, superman dive anything that looks remotely dangerous, always move in circles around him so you're never in front.
If you play really safe, not "I'm going to try to dodge this stuff inbetween attacks and unleash my full combos on him and oh I'm dead now", he's very simple because the hitboxes of his attacks are small and they're not fast, or surprising. Really just spend a couple of minutes not actually attacking and observing his attacks and you'll see what I mean, he basically can't hit you if you're just running around(even when not sprinting). He has fairly low health so you don't need big damage, it's only challenging when he's on a 15mins timer for an investigation. Obviously for farming him, you'll want to play more agressive since you don't want to spend 30mins every kill, but for the quest first time it's good to take your time and get comfortable with the fight.
