Since I’m on the topic of KaruMana... I find it funny when people say things like
"Karma and Okuda never talk/interact!”
"All Karma did was talk about his fear to her! It didn’t mean anything!" or
"Karma is just using her scientific knowledge for his pranks!"
Lol, people need to read the official fanbooks/data books (Roll Book Time/Graduation Album Time). The nature of Karma and Okuda’s friendship and why they get along so well is covered in those books. But what’s more, those details aren’t just background information stuffed into (official) supplementary material -- those elements of their friendship detailed in the books are actually reflected in the manga.
Karma is wary and distrusting of others, so Karma confiding in someone what he’s afraid of is a testament to how much he trusts them. That cave scene with Karma and Okuda is not a “nothing” scene. It’s significant to Karma’s character and development for multiple reasons, one of which is that it showed he’s able to drop his barriers and form a genuine friendship with Okuda. The idea that he’s only “using” her for the sake of his pranks is a false indictment of Karma’s character and it devalues their relationship, which is a lot more subtle and nuanced than many other pairs in the series.
People can choose whatever the hell they want to ship (and not ship) because it’s all about preference, but I roll my eyes whenever people try to invalidate Karma and Okuda’s friendship just because it doesn’t suit their shipping agendas -- especially when there’s a lot of solid evidence that they are close.