Shijou Saikyou no Deshi Kenichi

Kenichi Shirahama is a good-natured but bullied 15-year-old boy. Tired of being weak, he joins his school's karate club to grow stronger, only to end up as mere target practice for his seniors. However, the beautiful transfer student Miu Fuuriniji changes Kenichi's undesirable fate: she is a first-rate martial artist who introduces him to Ryozanpaku dojo. There, Kenichi meets the dojo's six eccentric masters, who then decide to take him in as their disciple! Shijou Saikyou no Deshi Kenichi tells the story of history's strongest disciple Kenichi as he trains tirelessly under the world's greatest martial artists—who each specialize in their own martial art—to gain the strength to protect the people and values important to him.

Ryouzanpaku needs money and Shigure takes a job offer where she has to tutor a little foreign girl for one week. She doesn't only teach her martial arts, but also how to make friends. (Source: Kenichi Wikia)

From Mangadex: Spin-off from History's Strongest Disciple Kenichi. Note: Only read this manga once you're up to at least chapter 313 of Kenichi main series. Released at the same time as Kenichi volume 48 (containing chapters 448-457), Kenichi Plus is a collection of three short stories that will take us back in time… The first story features Tanimoto, as he kindly reminisces his memories of Kano Shou, from the first time he met him, up until Kano Shou last fight… In the second story, we follow Loki and No.20 adventures, as they start and struggle to run their detective agency. But that's when Niijima shows up with a request that fit them perfectly. For the final story, which features Renka, we will follow Pisuke's story, a bird who lived many adventures before ending up as Renka's pet

Tatakae! Ryouzanpaku Shijou Saikyou no Deshi, relates the story of a peaceful yet weak boy, who one day, after being beaten up really bad by some of his school comrades, decides that being bullied around isn't an option anymore. Seeking revenge on his bullies, the young boy, Shirahama Kenichi, decides to join a fighting dojo. But what he doesn't know is that the dojo he wants to join is actually a place of gathering for those who have mastered different types of fighting styles. Thus begins his journey...

A 4-panel comic strip crossover series featuring characters from both "History's Strongest Disciple Kenichi" and "Skill Hunter Tekuni".

Shigure looks for a part time job

Pairing: Miu x Kenichi