Irresistible

Ai Sato has just started the last year of high school. She's unknown in her school. No one knows her but she knows everyone. Especially Chiyo Tanaka, her former classmate in elementary school. She's the opposite of Ai - known and popular. But when Chiyo starts recognising Ai she turns her world upside down. Why does the most popular girl recognise the most shy and unknown girl in their school?