What Kai did here is a major gamble but I think it could also just be her deep understanding of how determined and super strong bocchi really is. With the exception of extreme bullying and being outcasted by the entire class I don't think there was ever going to be a scenario where the pure...
Just a reminder that there's an anime and I highly suggest to watch it first since it dives deeper into the story than the Manga. And the voice acting and animation is also pretty good and sweet