Reborn to Master the Blade: From Hero-King to Extraordinary Squire, Vol. 1 (light novel)

On his deathbed, a hero king who lived his life for his kingdom and people wishes that in his next life, he will be free to focus on mastering swordsmanship. A goddess answers his call, and he is reincarnated many years in the future. But following his reincarnation, the old king is now...a cute girl?!