Anime Like Kill Blue

Juuzou Ogami is a legendary hitman who has never failed an assignment. While on a job, he is stung by a wasp and wakes up as a middle schooler!

Before he can even adjust to the body, his boss gives him new orders—check out this middle school the boss wants to send his daughter to by infiltrating it! Juuzou does as he is told while he waits for his ex-wife to research a cure, but there is only one problem—Juuzou is really awkward around kids.

The greatest assassin on Earth lived only to be a tool by those that wished to wield his mastery. That is, until they decided that he was no longer needed and ended his life.

By the grace of a goddess, this masterful man was reincarnated into a new world where he is asked to kill a hero that will later bring about the end of that world.

Deciding to finally live for himself, this man, now named Lugh Tuatha De, puts his skills as a killer to the test with foes who wield real magic.

Tarou Sakamoto was a legendary assassin with unmatched prowess. However, five years ago, Tarou Sakamoto disappeared from the criminal underworld.

It turns out that he decided to retire after he fell in love and got married. Now with a wife and young daughter, Sakamoto put on a little weight, works with his wife at a convenience store, and has given up killing under their family rule—absolutely no killing.

However, his peaceful life is threatened when Sakamoto’s old partner, Shin Asakura, comes after him. While he is able to peacefully work things out with Shin, the large bounty that was placed on Sakamoto’s head means that Shin won’t be the only one coming to upend Sakamoto’s peaceful life.

Among the underground, various families have worked in a specialized area of assassination for centuries, leading to their skills becoming so powerful that they are now Masters. Gero is the son of the Poison Masters Clan and skilled in the techniques. However, with his grandmother aging, it is time to think of the future of the clan. Either Gero or his sister must get married and produce an heir.

To save his sister from dissolving her lesbian relationship, Gero endeavors to find someone to spend his life with. Due to his awkwardness with women, he enlists the help of Mei Kinosaki, a marriage swindler, to help him find a wife.

After his family died in a car crash when he was young, Taiyo Asano became increasingly socially inept. Now in high school, the only person he is able to really connect with is his childhood friend, Mutsumi Yozakura. However, one day he discovers that Mutsumi is actually the future head of a family of the world’s strongest spies, despite having no special spy abilities herself.

With her eldest brother ultra-protective of his little sister ever since she got injured as a child, he has marked Taiyo for execution. The only way to survive his lethal spy skills is for Mutsumi to marry Taiyo, thus making him part of the family.

While Taiyo resists at first, he eventually agrees to marry Mutsumi as well as to train to become a world-class spy himself to ensure her protection.

An assassin simply known as Fable has earned a legendary reputation in the underworld for ruthlessly, efficiently, and successfully carrying out hits for organized crime. However, after six years of efficient murder, his boss fears too much heat from authorities and tells Fable to take a year off.

Forced to move to Osaka and live like a normal citizen for a year with his handler staying with him under the guise of being his sister, Fable decides to try his best to follow these new orders.

However, the Osaka mafia is not happy to learn that the legendary Fable has come to stay in their territory. Between threats and plots going on in town, Fable still tries his best to be a perfectly normal person.

Kazuki and Rei are roommates that also work as professional mercenaries while they each flee from their grim memories through the dangerous work.

However, while carrying out an assassination on Christmas Eve, their paths cross with four-year-old Miri who traveled to Tokyo by herself, told by her mother who abandoned her to go find her father. Unfortunately for everyone involved, her father was their mark whom they successfully took out.

Now saddled with a small child, this pair of grown men struggle to adjust to being new parents while also balancing it with their dangerous job.

There is no order too big for master spy Twilight.

He uses his numerous skills as a spy to keep the peace between his country and aggressive neighbors, but his recent mission demands he investigate a reclusive politician that only attends school events for his child.

Dictating that he must now have a child and wife of his own to pull off the mission, Twilight manages to recruit a small orphan girl and an office lady to play the roles.

However, what he doesn’t know is that his new daughter is an esper capable of reading minds and his new wife is actually an assassin using him as a cover to maintain a guise of normalcy.

Arata Kaizaki is an unemployed 27-year-old that has thus far been living with the financial support of his parents and part-time jobs. After leaving his first job after only three months, he has not been able to find proper work.

However, after a night of drinking with his friends, he meets a mysterious man that offers a drunk Arata a pill that will turn him 17 again so that he can redo a year of his youth, all expenses paid.

Will Arata find what he needs to live a happy life after one year in high school again?

Despite his teenage age, Shinichi Kudou is one of the great detectives of the world. However, one day when he witnesses some illegal going-ons, criminals catch him and dose him with a mysterious drug.

Next thing he knows, he is waking up as a little boy again. Now Shinichi must try to solve his own mystery while stuck as seven-year-old.