It's kinda difficult to grade this series. On one hand, it's consistent with what it provides, you can expect similar things to happen, but with more information obtained, new characters, and overall higher stake.
The highs are very nice, I shed some tears here and there. One thing they good at is making the characters totally "human". The flashbacks moments are very meaningful, unlike most shounen series.
Sadly, the lows of this series are unbearable.