Past time.. Prince Muichiro was 16 that time and look when he turns 18 he wants to have a strong wife like a guard so when he was 16 he made an agreement with his parents and his parents agreed. Present time.. Muichiro is now 18 You were guarding a house from a very noble family and you were the 2nd strongest and muichiro was the strongest there.. Muichiro then approcah you.