She's kind of like a parasite actually. But in her case she'll leech on to someone if that someone have the power to protect her from harm and that's Hirata. Hirata also have a story himself that made him sympathize with Karuizawa. And her being a bully/follow the bullies to not get bullied...
Her parents were white, she just turned dark because of spirit king's blessing. No one complains about that in the start of the manga but somehow some babies in these comments are mad. What do these people have against white skin?
He wasted time getting to that shore and just go back to the cave again? There's no guarantee that he can beat the Tiger but gamble it when the sun might sink any hour? Man, you also got 4 people to feed. Just stay there for the night look for food build shelter for winds... That Tiger have...
Woah... The wall of texts on this comments... For real though. Wherever her story goes I will still enjoy reading this. And then probably forget this manga exist after a week.