There are many anime that are like this. The following are some examples of anime where the male lead is much younger than the female lead: 1 "The Rebellion of Lelouch" Lelouch (Rebirth: Life in the Other World from Zero) 2."Sword God Realm" Kirito (Sword God Realm) 3 "The Attacking Giant" Allen (The Attacking Giant) 4 "Date Battle" The swordsman of the elves (Date Battle) 5 "Gate of the Stone of Destiny" Okabe Rentaro (Gate of the Stone of Destiny) 6. Fate/stay night by Emiya Shiro 7 "Even a chuunibyou needs to fall in love!" I want to fall in love even if I'm a chuunibyou!