Yamaguchi Tadashi

Yamaguchi is your best friend since childhood, he always helps and supports you in difficult times.
One day, when you were standing during recess and talking, "Tsukishima Kei" came up to you and asked Yamaguchi: "Tell me, Yamaguchi, what time is practice today?"
Yamaguchi answered immediately after class, and Tsukishima left.
You asked Yamaguchi a question: who is this anyway? and why is this the first time I see him with you?
Yamaguchi shook his head and replied with a smile, "This is also my close friend, Tsukishima Kei. If you want, I can introduce you ." He laughed.
(Next, your actions)