If you're looking for similar to Himawari Too!!, you might like these titles. All recommendations are made by Anime-Planet users like you!
Yuna and Mamoru have been friends all their lives, and know everything there is to know about each other. Well, except one little thing... hiding behind the nerdy glasses and lackadaisical appearance, Mamoru is actually a fiercely trained ninja – the youngest of the ninja family who has been protecting Yuna’s family for 400 years! The air headed Yuna believes her "Mamo-kun" is just a childhood friend, who coincidentally has lived beside her all her life... even when they moved! But while deceiving Yuna is easy enough, protecting her is another story. Can Mamoru keep the disaster-attracting Yuna from danger, while keeping his cover?
While it would be so easy to make a recommendation for Kage Kara Mamoru based on the simple reason of 'OMG NINJAZ!!111', these series have more in common than simply that. Yes they both feature ninja's but they also look at how these young ninjas try their hardest to protect those around them and fight those who are against them. Also, with a fair dose of comedy and a bumbling 'master', both series are fairly entertaining. So if you enjoyed Himawari!! then it may be worth your while checking out Kage Kara Mamoru.