I genuinely blame narumi bruh. Yeah yuka made the decision to use the warphole instead despite the risks just so that they can all leave together BUT she wouldn't have been pushed to that decision if narumi didnt keep on insisting on chasing her even after blatantly she told him not to (multiple times mind you) and even leaving him passed out so that he wouldnt follow her.
Yuka really hit the nail on the coffin when she said that naru's love is very selfish, where he cares more about his own feelings instead of the other person. Thought he changed after meeting mikan and the whole injury arc but nope dude just reverted back to his older self whenever it comes to yuka.
At least when it comes to shiki and yuka, shiki doesnt actively impose himself onto yuka like how naru does. Yes he does impose his feelings onto her when he still decides to stay close to her despite knowing how she feels but unlike naru he actually puts yuka's benefits first and not his own feelings towards her first. Shiki would never do anything that might jeopardize yuka's safety just because of his feelings for her. Uk who would and did tho? FREAKING NARUMI.
Still mad to this day that yuka slightly leaning more towards naru instead of shiki. My boi shiki deserved more love man😔💔