Omae wo Oniichan ni Shite Yarou ka!?

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Sinossi

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! (Source: Baka-Tsuki)