Ai Mizuno

Born: March 7, 1992
Died: August 4, 2008 (age 16)
Height: 160 cm
Weight: 42 kg
Three sizes: B81-W56-H80

The legendary lead singer of Iron Frill, the top idol group of the 2000s, which Sakura idolized in life. She's incredibly strong-willed and not afraid to say what's on her mind, making her the most vociferous critic of Kotaro's plan among the group.