At first glance, this reason can probably be found directly in the title. After all, it's supposed to be about "The Wrong Way to Use Healing Magic", but I don't see much of it. The protagonist trains until he drops and when he falls over, he heals himself so that he can carry on. As a result, he becomes extremely muscular within a few days and also masters his magic excellently. Unfortunately, this idea is almost too normal to be interesting. After all, there could be some really extreme stuff meant here - too much healing and creating cancer, for example.
Furthermore, the anime is very lame and riddled with scenes where nothing happens. Conversations upon conversations upon conversations - shouldn't be bad for a series, but unfortunately neither characters, themes nor world are interesting and the animations or music aren't good enough to make you really want to listen. The conversations are so devoid of content that you can skip through them and still understand everything!
Conclusion: More mush for us. Maybe the missing episodes will be convincing, but after watching the first 6, I don't think so.
