Uchi no Ototo domo ga Sumimasen

Ito is a second-year high school student and an only child who has to move to a different city; her mother remarried and begins her new life as an older sister of 4 siblings! The start of a family-love-comedy with four step-brothers! (Source: MangaUpdates) ~~ Adapted from the manga series "Uchi no Ototodomo ga Sumimasen" (うちの弟どもがすみません ) by Ozaki Akira (オザキアキラ).