The one whom the coward me loves is the cool but kind Shinobu-kun, I want to say "I Love You" one day. Will my wish... come true....?

Seiji, the younger one, and Ai, two childhood friends, happen to live together. Ai has an omamori to get a boyfriend. She thinks she wants 'a very loving but cheeky boy.' But when she accidentally witnesses Seiji's date and kiss, her heart starts hurting. Why...?
(Source: Shoujo Crusade)