there is a subjugation towards the end of the volume
during which Sei proves 100% she is the saint
( in terms of the webnovel this is at ch 23 or so, the subjugation is 32-35), quickly followed by a confrontation with the idiot prince.
@TrapCard113 : unfortunately the prince is not getting one soon
there are 2-3 more major events if I recall (the last of which takes Sei being the saint from strongly suspected to 100% verified), this is early to half way into vol 2, the prince gets his smack down at the end of that volume
I really like when authors think about how abilities or advantages of characters/worlds would shape activities and industries beyond what is relevant to the story. it's great for world building.