Papa no Iukoto wo Kikinasai!
パパのいうことを聞きなさい!
novel
A spin-off of the main series that takes place four years after the events in the 18th volume. *Note: Includes 2 extra chapters.*
manga
Papa no Iukoto wo Kikinasai! explains the day-to-day of an universitary student that has to live with three sisters that are not from his family: a tsundere (14 years), a little demon (10 years) and a small girl (3 years). (Source: Animesque)
manga
An anthology focusing mostly on stories of side characters adapted from Papa no Iukoto o Kikinasai!

