From the manga "Marmalade Boy"

No mistake, please accept~- Thank you~

Marmalade Boy (ママレード・ボーイ, in English Marmalade Boy) is a Japanese girls' manga series drawn by Shibu Yoshizumi. Little Ishikawa Kouki (Koishikawa Miki) is a lively and cheerful and cute high school 2 girls, living an ordinary simple life. However, one day, her parents suddenly told her, "We're getting a divorce! The reason is that they are in love with another couple at the same time, and what's even more outrageous is that the two families are going to live under the same roof! Oh, my God! Things are really getting complicated...

The other couple has a son, Yul, who is the same age as Mitsuki, and he's a cool, handsome, 200 IQ and athletic perfect boy. His appearance has caused a big change in Mitsuki's peaceful life: Mitsuki is forcibly kissed by her classmate Ginta, and is made to laugh and cry by Yui's ex-girlfriend, Arisumi... What is even more shocking is that Mitsuki has fallen for Yui! Ah~ How could this happen!