My younger brother became ridiculously strong when he trained as his sister told him Chapter 4.5

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A Younger Brother Who Had Become Ridiculously Strong After Training as His Sister Told Him to Do ; Ane ni Iwareru ga Mama ni Tokkun wo Shiteitara, Tondemonai Tsuyosa ni Natteita Otouto ~Yagate Saikyou No Ane o Koeru~ ; 姉に言われるがままに特訓をしていたら、とんでもない強さになっていた弟　～ブラコン姉に鍛えられすぎた新米冒険者、やがて英雄となる～

, Author: YOSHIDA An.