Harada is still struggling to overcome his amnesia. He tries his hand at a former pastime of his, plus reconnects with an old school chum in the hopes that this might trigger some memories.
Oh, Sou?
سو؟
Ach, Sō-chan?
Ah, ¿Sou?
Ah, ¿Sou?
Ah, Sou-chan?
А, Со?