Hakenshain Asuka no Motoyan Gohan

Asuka Yoshino is a legendary delinquent known as "Gunma's Rampaging Eagle"... After graduating from high school, she became a temp worker in Tokyo! Asuka plans to get a full-time position and a promotion, while hiding her delinquent past. However, she has to deal with many challenges on a daily basis... Her vital energy source is a quick meal from the convenience store!

(Source: Comic Bridge, translated)