MANGA

Ane ni Iwareru ga Mama ni Tokkun wo Shiteitara, Tondemonai Tsuyosa ni Natteita Otouto

21 chapters10 sources

Latest: Chapter 21

Updated Sep 9, 2026

Read Ch. 21

Chapters

Updated Sep 9, 2026

All chapters41

Synopsis

"If you're an adventurer, it's normal to be able to do this much!" Rose then set Shifa through a series of training exercises, telling him, "If you want to be an adventurer, you have to be able to do this!" Shifa believes Rose's words and tries his best to complete the ordeal. However, Rose's training becomes more and more extreme in order to prevent her brother from being in danger when he becomes an adventurer.... An isekai adventure fantasy involving a boy who has become ridiculously strong after being trained by his strongest brocon sister! Official JP: Comic Earth Star, Official channel of Comic Earth Star in Nico Nico Seiga

Genres

Adventure Shounen Action Fantasy Harem

Details

Type: MANGA
Updated: Sep 9, 2026

Alternative titles

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

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