User blog comment:Jopjopjop/Volume 18 Spoilers/@comment-16281343-20140623041636/@comment-4829046-20140624052458

Shifty in the sense that his mood changes randomly. Sure that happens to all of us, but it is more apparent in LN series.

And yes, Maken ki! did get like that. I originally wrote it off as a useless fan service series when I first saw the anime but when reading the manga(which they horribly adapted in the anime btw) I was blown away by the sheer brutality and tragedy that was mixed in and also the rather splendid art. Similar thing happened to me with DxD. It was the source material that really got me into it, not the overly fan service focused anime.

"I don't think that's a good thing though lol."

Try putting yourself in their shoes and think about having to save the world(or at least a small portion of it) and then it makes sense lol. If you don't get into the more serious relationship, then the heartache will be a lot less. It will still be there, but it is not the same as losing someone you have declared your love to and have been "intimate" with for a while. You might call it a cliche in action series, but it does have real world relevance. However, as a counter to this we have another option. Giving your partner something to live for besides you in the case of your death. Usually this is a child but could be some other relation too. Sometimes it is an objective, but those can get twisted. Taking care of someone or something is less complicated than fulfilling some grand goal. However this could backfire since some could go into extended depression anyway so no solution is perfect.

Also but Maken ki! doesn't need a harem end so technically he means dating just one and answering the feelings of the others. The most daring since day one of his harem dropped out shortly before he announced that he will think about romance later and the other overly clingy one can drop out rather easily as well, making the options very small. So it isn't like DxD. In DxD no one that has displayed deep deep deep attachment to him will drop out.