Oh I know the story so basically in a nutshell War has been declared by us humans who once were wizards and because our soldiers and powers we're way more stronger than humans we won the war and sealed monsters away with a barrier that requires 7 human souls to reopen it as well as a boss monster. One day a human called Chara ( or assumed to be chara ) be freinds aserial but unfortunately the child grows sick and aseril goes to human village to seek help and unfortunately they assumed that aserial killed the child and thus kill aseril and fuses his soul with the flowers ( now known as flowly) and based on your descions you can kill everyone, kill and spare a few, or free everyone and break the barrier
