A man with a passion for vending machines awakens to realize that he has not only died, but he has also been reborn as one of his beloved machines! Although he is a modern appliance in a fantasy world, he requires money in order to keep functioning. He is stuck in one location until a young girl named Lammis stumbles upon him. Amazed by the drinks and food he sells, Lammis uses her "Blessing of Might" to lift him with ease and take him back to the village of Clearflow Lake. There, she officially dubs him Boxxo. Despite his inability to converse with the villagers, Boxxo becomes an essential part of the community. His goods provide nourishment, and, as he gains new abilities and products, he becomes a staple of daily life. Nobody is as loyal to Boxxo as his first and best customer, Lammis. The more time he spends with her, the more he tries to help her elevate her skills as a young hunter.

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.

Memories, both good and bad, suffuse the high school experience. Whether it's hanging out with friends or cramming for tests, everyone has something they will remember from that time in their lives. At a certain high school, one class is faced with an event that can cause people to look back on their high school days in sadness: the death of a student. The deceased is not just any student—she's Tomie Kawakami, a popular girl with an almost otherworldly beauty. Her death was particularly gruesome: her body was dismembered and the pieces scattered. As the class tries to make sense of the situation, they are shocked when a familiar voice calls out to them from the doorway, apologizing for being late. With raven hair and a beauty mark under her left eye, this girl is the spitting image of their murdered classmate. But she can't actually be Tomie, right?

Since the death of his wife, Kouhei Inuzuka has been caring for his young daughter Tsumugi to the best of his abilities. However, with his lack of culinary knowledge and his busy job as a teacher, he is left relying on ready-made meals from convenience stores to feed the little girl. Frustrated at his own incapability to provide a fresh, nutritious meal for his daughter, Kouhei takes up an offer from his student, Kotori Iida, to come have dinner at her family's restaurant. But on their very first visit, the father and daughter discover that the restaurant is often closed due to Kotori's mother being away for work and that Kotori often eats alone. After much pleading from his pupil, Kouhei decides to continue to go to the restaurant with Tsumugi to cook and share delicious homemade food with Kotori. Amaama to Inazuma follows the heartwarming story of a caring father trying his hardest to make his adorable little daughter happy, while exploring the meanings and values behind cooking, family, and the warm meals at home that are often taken for granted.