it’s the railtracer
"sharing an umbrella as a couple in Japan is considered a romantic expression, and teens often draw an umbrella with their name and the name of their crush, the way one would in a heart."
Mother, a few days ago I met a girl named Katsuragi.
I heard she is the sole survivor of that expedition team.
She had lost her speech for quite a while, but now it seems she wants to make up for it and never stops talking.