Quote Originally Posted by Mimiru_S View Post
Bah. The weak-minded fool, got himself possessed.
Spoilers incoming so hiding this for those who haven't finished the original story yet:

Actually, he worked himself to exhaustion because he blamed himself for things out of his control and that created an opening for the enemy to take control. Everyone has their limits and he was trying his best. Trying his best just happened to cause his downfall that time