BXBX NOVEL 
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!
- Volume 1, Prologue
- Volume 1, 7th of April, Sunday
- Volume 1, 8th of April, Monday
- Volume 1, 9th of April, Tuesday
- Volume 1, 10th of April, Wednesday
- Volume 1, 11th of April, Thursday
- Volume 1, 12th of April, Friday
- Volume 1, 13th of April, Saturday
- Volume 1, 15th of April, Monday
- Volume 1, 16th of April, Tuesday
- Volume 1, 17th of April, Wednesday
- Volume 1, 18th of April, Thursday
- Volume 1, 19th of April, Friday
- Volume 1, 20th of April, Saturday
- Volume 1, Epilogue
- Volume 1, Afterword
- Volume 2, Prologue
- Volume 2, 21st of April, Sunday - Prologue
- Volume 2, 22nd of April, Monday
- Volume 2, 23rd of April, Tuesday
- Volume 2, 24th of April, Wednesday
- Volume 2, 25th of April, Thursday
- Volume 2, 26th of April, Friday
- Volume 2, 27th of April, Saturday
- Volume 2, 28th of April, Sunday
- Volume 2, 29th of April, Monday
- Volume 2, 30th of April, Tuesday
- Volume 2, 1st of May, Wednesday
- Volume 2, 2nd of May, Thursday.
- Volume 2, 3rd of May, Friday.
- Volume 2, 4th of May, Saturday.
- Volume 2, 5th of May, Sunday - Epilogue
- Volume 2, Afterword
- Volume 3
- Volume 3, Prologue
- Volume 3, 6th of May, Monday.
- Volume 3, 7th of May, Tuesday.
- Volume 3, 8th of May, Wednesday.
- Volume 3, 9th of May, Thursday.
- Volume 3, 10th of May, Friday.
- Volume 3, 11th of May, Saturday.
- Volume 3, 12th of May, Sunday.
- Volume 3, 13th of May, Monday.
- Volume 3, 14th of May, Tuesday.
- Volume 3, 15th of May, Wednesday.
- Volume 3, 16th of May, Thursday.
- Volume 3, 17th of May, Friday.
- Volume 3, 17th of May, Friday cont.
- Volume 3, Epilogue
- Volume 3, Afterword