Happy Princess (2007)

Tomoyuki is a high school student. He temporarily lives alone because his parents are abroad on business. But, he enjoys his life with his childhood friends and classmates. One day, his peaceful life suddenly changes... Several girls appear in front of him, and tell him, "Choose one girl whom to marry!" He doesn't know what's going on, but his friends join this battle as well. Whom will he choose in the end...?