Read manga: Anitsuu!

manga
Other name: アニツウ!
Artists: MUNEYAMA Yoshimi
Status: completed
Latest chapter: Vol.001 Ch.004 (end)
Updated at: Mar 06, 2013
Summary:

After the remarriage of his father, Takara finds himself becoming the eldest of the 4 siblings. Wanting to try his best as the oldest brother, Takara ends up stumbling and tumbling with his relationship between his 3 younger siblings. Each chapter tells the tale of how Takara bonds with each sibling.