Rendezvous with Life: Mayumi's Verdict

After the concert, Miku Izayoi and Shido Itsuku relax by the pool, and on the way home, Itsuku meets a mysterious girl who only he sees. The next day, a huge invisible sphere appears in the city of Tengu, visible only on a special radar. Shido will have to solve the mystery of the sphere and figure out who this mysterious stranger is.