Well that escalated quickly.
I enjoyed this series and while I was expecting a more relatable ending (as save for the boy's father being killed by his brother it had been a pretty relatable coming of age story until this point) this was a well deserved grand finale, perfect for the roller coaster of emotions this series was, and this song alone is a rollercoaster of emotions on itself.
I'm impressed on how you mixed the spanish vibes with some jrpg battle theme vibes, and how you used melodies from previous installments, it really added to the conclusive feeling.