So the last thing I remember about Shield Hero ( or Tate no Yuusha no Nariagari )was the part where he became evil? He started jumping on islands or something. I don't really remember much, I'm not sure if he got possessed or got taken over by wrath, its been that long. So if anyone has any idea I will be much appreciative!
I think that's when he awakened to one of the new Seven Deadly Sins and became paranoid thinking that Raphalia was dead. Under the New Seven Deadly Sins arc. Check Baka-Tsuki as they the arc names listed I believe