- shiho and himari got insanely close way to fast, almost as fast as yori and himari,
- yori bottling her feelings instead talking with himari is such a NTR cliche
- the insane lengths himari goes to paint shiho in a more sympathetic way despite her being so unlikable doesn´t feel like a coincidence
- at ch 30 himari´s tries to kiss yori but she rejects her advances leaving her really dejected this is quite literally the plot of a lot of NTR hentais this is just a theory but im willing to bet that shiho is going to swoop in and confort hima after that
i hope im just reading too much into this but there´s some flags that seem to point in that direction. Again i hope im wrong but a small part of me wants himari falling in love with shiho i´d be such a spicy development and honestly the only way i can see the manga picking up the pace
I am incredibly skeptical. My Japanese is pretty limited, but from what I can make out from the raws without looking anything up, it looks to me more like she's saying she wants their first kiss to be more special and then while they're feeling awkward and frustrated afterwards it she invites her to go to a festival fireworks show. It's pretty obvious she's thinking "So um, this might be a very appropriate place for us to have our first kiss..." I honestly can't see Himari being upset enough after the way that shook out for Shiho to have any reason to swoop in.
Also, Himari is innocent and forthright to a fault, I cannot imagine a universe in which she cheats on anybody, and going NTR would be absurdly out of theme for a series like this. At most I could see Shiho trying to steal Himari to hurt Yori the way she feels Yori hurt her by taking Aki's affections, but such attacks would just glance harmlessly off Himari's sincerity.
I swear, some people on this site are DEEPLY paranoid when it comes to NTR. You're reading too much hentai manga, it's interfering with your ability to understand plots that aren't based on porn fetishes.