Saikyou no Ousama, Nidome no Jinsei wa Nani wo Suru?

(The strongest king, what will he do in His second Life?)

It is an excellent choice for enjoying the Japanese novel because it follows the story of a brave and powerful king who has died in his first life. Then he is reincarnated in a new world. He has all his memory and abilities. He finds a Life of relaxation which will be free from the responsibility of ruling. He tries to protect his Loved ones and discover a new purpose. It also shows action, power, personal growth, and fantasy elements,  which makes it interesting for viewers.