Defend the Rose

Born into poverty, Boole fights to rise through the ranks of the personal guards for one sole purpose, and that is to be closer to the Saintess. However, in a series of events, he winds up being the royal family's pawn to to defeat the church. On one hand is the girl he has longed for since ages ago, but on the other is the omnipotent crown prince. Which will the young knight choose?