Golden Time Vol. 4 (manga)

Life, love, and education! College freshman Tada Banri is looking forward to a new lease on life, starting with his ambitious journey and entry into a private law school in Tokyo. As luck would have it, during the opening ceremony for the freshman class, he happens across an unfortunate person from his past. Her name is Kaga Kouko, a buxom-beauty who slaps Banri's new friend, Mitsuo, across the face with a bouquet of roses. Just who is she and what's her beef with Mitsuo?