
One day, Yoichi who grew up while not knowing his parents has received the news of his father's death. His father left behind a testament——which said he is to pick only one out of five 'little sister candidates'?! "...I don't want to work, I want to laze around together with Onii-chan." (By Serene) "Let's have a match! If I win, Nii-chan will... make me his little sister!" (By Tomomi) "Onii-sama will choose me, isn't that right? It's our destiny." (By Sayuri) "To be more girly, that's why I want to be Nii-san's little sister!" (By Yuuki) "If Mii-chan becomes Nii-chama's little sister, she will become rich right?" (By Mika) The little sisters who were presented to him had more than one or two odd quirks, a slapstick comedy between siblings starts here!
Omae wo Onii-chan ni Shite Yarou ka!? is a Japanese novel of 283,092 characters, with 10,692 unique words and 1,725 different kanji. Its difficulty rating on Jiten is easy, 2.0 out of 5. The full vocabulary list ranks all 10,692 words by how often they appear, and you can study them on Jiten or download them as an Anki deck.
Here are some of the words that appear most often in this media, as well as a sample of its rarer vocabulary.