MTL - I, The Grandson of Garp, Scared Luffy Into Tears - Chapter 15

Year 2056, in a city in the Yuan Jiang Su Jin area. On top of a ruined, shattered six story residential apartment sits a teenager wearing a combat vest, militaristic trousers, and alloyed battle boots. On his back is a hexagonal shield and equipped is a blood-shadow battle knife. He sits there silently on the edge of the roof. At this time, the sparkling sky was shining and there was a refreshing breath within the air that blew towards him. However, there was only silence within the ruined, deserted city, with an occasional howl that makes your heart skip a beat.

- Description from novelupdates

Kurogami Ichiro was desperate because he couldn’t achieve what he wanted when he once started his martial arts path at age of 8!

While others transmigrate into the role of a villainous young lady, I, on the other hand, became the ab*sed female lead in a sadistic novel! I’m trembling with anger, but there’s no one to seek justice from! This is a story about a girl who transmigrates into a weak, pitiful, and helpless heroine. With her natural charm, gentle demeanor, and a touch of tea-loving personality, she conquers the hearts of the villainous female leads, ultimately achieving a sweet and satisfying counterattack.