Kanna is old yes, like 1000 or so years...
But come on guys, Saikawa is literally a child. How this exists here is beyond me.
No I did not read it, I was reading Kobayashi x Tohru doujins and was then led to this garbage.
The manga & anime already portrayed her as a "sexy child". Their relationship was already sexually suggestive. What's next, "don't sexualize Boku no Pico"?