I saw from other comments that this is already finished and that there are only a few chapters left, so it makes absolutely zero sense to me why the author would toss in a love rival at this point in the story. It's not even a rivalry really since Yukito loves Natsuna and this new girl has no chance. Oh well, hopefully the author managed to wrap it up nicely. Looking forward to the next chapter.
If you eat a lot of squid to grow taller, it will result in a disaster: Squids don't have a skeleton, so your soft tissues may grow taller but your skeleton won't, meaning you will become all squiggly and wobbly.