The stands were teeming with Arsenal fans with 'Ryo' on the backs of their shirts and he capped off a promising display by converting a first-half penalty.
"This is my city - a lot of fans came here so it was very exciting," he told Arsenal Player.
"It makes me feel very good [to see Ryo shirts on the fans]. It's great for me as a football player.
"It's an unbelievable feeling to score. Everyone gave me a great chance to score so it was very good. It was a hard game but I need to get fit before the season starts so it's good for me."