When a 34-year-old underachiever gets run over by a truck, his story doesn't end there. Reincarnated in a new world as an infant, Rudy will seize every opportunity to live the life he's always wanted. Armed with new friends, some freshly acquired magical abilities, and the courage to do the things he's always dreamed of, he's embarking on an epic adventure—with all of his past experience intact!

Once the greatest hitman of all, Taro Sakamoto retired in the name of love. But when his past catches up, he must fight to protect his beloved family.

Rin Tsuchimi, a normal seventeen-year-old second-year high school student finds himself sought after by a variety of girls. Eight years prior, he lost his parents in a car accident that also took the life of Kaede Fuyou's mother. From that point onwards, he began living with her. At around the same time he lost his parents, he met Lisianthus and Nerine at different times who each were accompanying their fathers on a diplomatic business in the human world. Each girl became lost after wandering through the human world. During that time, Rin befriended each girl after playing with them for a day. As a result of his kindness, Rin finds himself as the potential marriage candidate for both Lisianthus and Nerine, the daughters of the king of the gods and king of the demon worlds, who recently transfer to Rin's school.

At Kaimei High School, the Living Assistance Club (aka the Sket Brigade) was organized to help students with problems big or small. Most of the time, though, they hang out in their club room, bored, with only a few trivial problems floating in every once in a while. In spite of this, they still throw all their energy into solving these worries.

The story follows the sometimes happy, sometimes sad, and a tad stressful daily life of "some sort of small, cute creature" (Nanka Chiisakute Kawaii Yatsu) known as Chiikawa. Chiikawa enjoys delicious food with bees and rabbits, toils hard every day for the rewards of work, and still maintains a smile.