1x5 - Masamune-kun's Revenge

Masamune saves Aki as she was about to be hit by a car, when the mysterious beautiful girl who was riding in the car comes out and says that she was waiting to see Masamune and hugs him. A few days later, a girl named Fujinomiya Neko transfers into Masamune's class, and Aki's mood has been worse ever since...