Takamine is giving me the same vibes as Medaka Box: she's so perfect with her skills that she's also unable to enjoy things that deviate from her "perfect" timeline. All in all between this dense mc and her perfectionist goals this is a sick relationship coated with a thin layer of wholesomeness.
A clear death flag, but one that can be reverted in a smart way, imagine that Fooly uses his recovery magic to the extent that he injects so much life that makes her...well, you know.
The gap between his current timeline and his reformed school life keeps getting shorter and shorter, what worries me is that eventually he'll be so drowned in happiness that he won't notice that the stalker will keep him trapped in a past-present loop.
Ngl, the fact that she's slightly taller than him brings me happiness, looking in the eyes of your loved one without looking downwards or upwards gives a sense of mutual trust.
It'd be interesting if this fight is a complex plot of the Worm to test if Ryuki can also work as a candidate for the Tiger's vessel or worthy donor for Ohma.