Onii-chan Lab.

Ikezawa Sumire's 3 elder brothers, Asagi, Ai, Kon are so beautiful even friends get jealous! Sumire too loves Asagi and Ai, but for some reason she just can't like Kon. That reason is...!? Elder brother X3 + younger sister= HAPPY & SWEET!? Sumire and her elder brothers' full of happiness "at home" comedy.