Guardian Ninja Mamoru is a tV series anime that premiered in winter 2006.

About the production: the story comes from a light novel, there are 12 episodes of about 24 minutes and its current status is "finished".

Its main genres are comedy and romance, with themes such as Ninja and Female Harem.

On AniList, Guardian Ninja Mamoru has an average score of 62%, an average score, and appears on 4,930 users' lists.

Kagemori Mamoru is a dowdy boy whose hair is disheveled and who wears thick glasses, but he is actually the son of a ninja family. They have protected their neighbors, the Konnyaku family, secretly for 400 years. Mamoru has personally protected their daughter, Konnyaku Yuuna, since they were in kindergarten. When Yuuna is in trouble, Mamoru puts on ninja suit and turns into a competent ninja to help her.

Official synopsis from AniList.