I do not even know what to say to make a convincing argument since people just like things sometimes, and it seems completely incompatible with everything good about anime. The manga had a bit of a cute appeal with an okay story, but all of that is buried in this movie.
The art, average to slightly good in the manga, is replaced with triangle faced characters whose eyes may or may not pop out of their heads depending on the moment. The shading is completely random, often covering exactly one half of the face, which might make sense (and still be incompatible with how shading works in real life) in a horror anime, but this is a drama. Movement is usually incredibly minimal, since no one involved knew how to animate. After being a weird warped round shape, suddenly the eyes turn into Skip Beat eyes in one scene. The roof that you get shown over and over is glossy, since clearly that is how this author thinks roofs actually are.
While nothing about this could be worse than the art already is, none of the angst involved is intelligent, the voice acting is feeble, the book references make far less sense than the manga, and everything crawls at an ant's pace. Without a doubt this is the worst anime film I have ever watched.