An egg with an unblinking eyeball might be perceived as an unsettling act of defiance against the universe's natural order, and while that may remain the case, there are undertones of playfulness and curiosity within its strikingly blue iris.
The lack of an eyelid has forced Kasaii eggs to rely on high levels of humidity as an alternative for keeping their eye well-moistened and free of debris until hatched (where the creature's long and slimy tongue will then serve to maintain its eye care routine).
In what appears to be the case for many yōkai, a particular subset of elusive supernatural creatures, Kasaii are not exempt from causing mischief for those living around them.
It is during rainstorms that Kasaii are very fond of going on walks with their owner (or rather, being held by them). Of course, one must be prepared for when their Kasaii inevitably shut themselves closed and soak the poor, unsuspecting owner below.