Natsu no Sazanka

One day, Tsubaki Fuyuno, the main character, begins to feel afraid of "everything and everywhere in everyday life" and knocks on the door of a psychiatrist. She is admitted to a hospital for rest and relaxation.
In the "closed ward," cut off from society, a young man stares at Tsubaki in amazement.

"I finally found you! Tsubaki!"

...... How did this man know my name ......?