Koroshi-ya wa Kyou mo BBA wo Korosenai

Makoto Nozawa is 77 years old, lives alone and favorite food is curry. All and all, she is an ordinary-looking little old lady. For some reason she has been targeted by multiple assassins, but every time she turns the tables on the killers. This BBA is the strongest in history. An invincible old-lady.
Note: Includes 5 extra chapters.