Renren Shinobi Yori

A young ninja's first employer is a high school girl?! In modern Japan, a village of ninjas known as the "Momochi Sect" remains hidden deep within the mountains. One day, Ruka, a young boy in the village, is assigned his first mission as a ninja, which turned out to be guarding Tenma Tsubaki, a high school girl...?! An age-gap rom-com between a ditzy JK and a cocky young ninja begins! (Source: GFantasy, translated)