That's a weird ship to say the least. As any ship featuring Eiko and not Sensei, it's always painful because of the whole Eiko/Sensei forced dynamic in the manga. I remember of another doujin with Kamu where it's more or less the same conclusion. As for Hana, it seem to be Tama but honestly i don't remember quite the early chapter and i've don't seen the anime so i can vaguely remember one or two moments with the two of them lately but not that much in constrat to the forced Eiko/Sensei moments or the underappreciated Kamu/Eiko moments.