Five years after winning the World Martial Arts tournament, SON-Goku is now living a peaceful life with his wife and son. This changes, however, with the arrival of a mysterious enemy named Raditz who presents himself as Goku's long-lost brother. He reveals that Goku is a warrior from the once powerful but now virtually extinct Saiyan race, whose homeworld was completely annihilated. When he was sent to Earth as a baby, Goku's sole purpose was to conquer and destroy the planet; but after suffering amnesia from a head injury, his violent and savage nature changed, and instead was raised as a kind and well-mannered boy, now fighting to protect others. With his failed attempt at forcibly recruiting Goku as an ally, Raditz warns Goku's friends of a new threat that's rapidly approaching Earth—one that could plunge Earth into an intergalactic conflict and cause the heavens themselves to shake. A war will be fought over the seven mystical dragon balls, and only the strongest will survive in Dragon Ball Z. [Written by MAL Rewrite]

Having just moved from Tokyo to Hokkaido, high school student Tsubasa Shiki decides to explore the picturesque winter landscape he could never experience in the nation's capital. It only takes a moment for Tsubasa's idealized view of Japan's northernmost prefecture to crumble, as the sheer cold and frigid air quickly overwhelm him. While trying to find the way to his new home, Tsubasa runs into Minami Fuyuki—a talkative and friendly Hokkaido native who, despite the cold, is wearing a short skirt. The girl wastes no time in striking up a conversation, and Tsubasa comes to realize that the winter weather is not all that is too much for him to handle. The next day, Tsubasa is shocked to learn that not only is Fuyuki in his class, but her seat is also right next to his. Swept along by Fuyuki's persistent advances, the young man soon becomes captivated by both life in Hokkaido and the beautiful girl determined to get closer to him. As he deepens his relationship with Fuyuki and meets other fashionable girls from his school, Tsubasa finds out that Hokkaido gals truly are adorable.

Following their heroic efforts at Walter Park, the students of the misfit class return to Babyls Demon School after their summer vacation. What awaits them is not only adoration and admiration but also the shocking revelation that, in order to stay in the luxurious Royal One classroom, the entire class must be promoted to Dalet rank before entering the second year. As the Harvest and Music Festivals are right around the corner, there seem to be ample opportunities to rank up. Doing so will not be simple, however, as no class thus far has managed to accomplish such a feat. Hoping to give the misfit class a chance to achieve the improbable, the school appoints special tutors to aid in confronting the challenges that lie ahead. With his sights set beyond Dalet, Iruma Suzuki decides to take strides toward the goal of ranking up, starting with gaining acknowledgement from his special tutor: the short-tempered and selfish Bachiko Barbatos.

Reina Aharen, a small and cute student with a quiet voice, is quite bad at determining distance and personal space. Sometimes she's inches away from your face, and at other times, miles too far! The only one who tries to understand her antics is Raidou Matsuboshi, who is seated beside her in class. He has a menacing face, but in reality, he is a kind boy with an imagination that can run wild at times. Aharen-san wa Hakarenai follows the peculiar pair as their odd friendship starts to blossom when Raidou picks up Aharen's eraser for her. She misinterprets his gesture and now believes them to be best friends, showing how the simplest of things can prove to be the most complicated of challenges for them.