Ngl I low key kinda hate this manga now like thing feel like they don’t make any sense anymore like I just wish they went down the route of the idol kohi helping the sister
Nepotism can only do so much, I dont think they'd accept even if she did try that, and as for that earlier statement, I dont think Himuro is fully to blame there. Not saying there's no fault, but its moreso a matter of not having a way forward proposed, aside from of course, the idol stuff by Kyapi, which is definately a trap.
Also the story very much does make sense even now... Older sister makes promise to younger sister that she cannot achieve, lies to her and relies on her younger sister's compliments to fulfill her lacking self esteem, leading to a toxic cycle.
Himuro is jealous of MC, and loves Kira, so tries to initially break them up without knowing their relationship, but that fails, so she lets it go for a bit until Kira brings up her dreams to her in convo, Himuro notices the delusion at hand, and decided to step in herself by bluntly placing reality in Sera's face. It hits her where it hurts and Kyapi forces a resolution before Sera can get her bearings, thus leaving her directionless, and taking the internet idol route in the hopes she can pave her way through the directionless dilemma.
But so far, it seems she still hasnt fully come to grips with herself and what she wants to do still, to the point she's almost broken.
Imma keep it real, this story isnt really non-sensical unless things went over your head or you binged it. Are you sure you read all the chapters and understood the bigger picture here?