The everyday Sanyo family gets an unexpected surprise in the shape of a new lodger-Hattori is a ninja boy who has come down from the Iga mountains to attend normal school. Befriending Kenichi Sanyo, who is the same age as he, Hattori starts attending school undercover, occasionally accompanied by his brother, Shinzo, Shishimaru the ninja dog, and Kenichi's girlfriend, Yumeko. The gang is also threatened by the rival Koga ninja, Kemumaki, and his evil sidekick, Kagechiyo the Shadow-cat. (Source: The Anime Encyclopedia)

In another world, there are two continents, east and west. The northern part of the Western Continent lives with the mysterious Snow Mountain tribe, while the southern part is occupied by the prosperous Daqin Empire. Magic is the source of energy in the world. The Daqin Empire relied on the power of magic to defeat countless enemies and disasters, and established a prosperous civilized world. A boy from a tribe with a forbidden demon physique from the north started a journey of magic cultivation in the southern continent full of magic power. Bai Xiao, the son of the Snow Mountain tribe, was forced to separate from his girlfriend Qingyue in order to unravel the curse of her. However, the alien world that is thousands of miles apart and the amnesia of his girlfriend couldn't stop Bai Xiao's footsteps. He set foot on the southern continent alone with countless treasures, and started the journey to find his lover. The man destined to become a genius shocked the entire empire with his astonishing talent and extraordinary audacity. Where will his magical path of cultivation go? Can he win Qingyue's heart again? (Source: Bilibili)

Nijiiro Days follows the colorful lives and romantic relationships of four high school boys—Natsuki Hashiba, a dreamer with delusions of love; Tomoya Matsunaga, a narcissistic playboy who has multiple girlfriends; Keiichi Katakura, a kinky sadist who always carries a whip; and Tsuyoshi Naoe, an otaku who has a cosplaying girlfriend. When his girlfriend unceremoniously dumps him on Christmas Eve, Natsuki breaks down in tears in the middle of the street and is offered tissues by a girl in a Santa Claus suit. He instantly falls in love with this girl, Anna Kobayakawa, who fortunately attends the same school as him. Natsuki's pursuit of Anna should have been simple and uneventful; however, much to his dismay, his nosy friends constantly meddle in his relationship, as they strive to succeed in their own endeavors of love.

Kaede is a normal school girl who was studying for her exams for school when suddenly she is interrupted by Shinobu, a girl who is a ninja-in-training, attempting to complete her exam. The problem is, in order for her to successfully complete her exam, she must steal one of Kaede's panties! In Kaede's attempt to stop Shinobu from stealing her panties, an unexpected friendship is forged between the two. Kaede soon becomes engrossed in Shinobu's world, surrounded by partying ninjas and a yellow pac-man like thing by the name of Onsokumaru, who claims to be the master of all ninjas!