From Dragon Voice Project:
Family Complex… This is exactly what Akira Sakamoto suffers from, being the second eldest son of the Sakamoto family and the only NORMAL person. The rest of the family consists of beauties, from the parents to the eldest son and the 2 daughters. Poor Akira feels that he’s totally out of place, and tries to hide this from the others… but then one day it all comes out. How will his family react to this? In this hilarious manga, every chapter is dedicated to one family member, starting with Akira. Family Complex isn’t quite like anything else.
The second eldest son, Akira. Appears in another manga Princess Princess as a minor character.