The 18-year old Japanese winger first joined the Gunners in late January before immediately joining Dutch club Feyenoord Rotterdam on loan where he did exceptionally well.
Since being back in North London, Miyaichi feels at home with the rest of the Gunners players and is confident his development, both with football and the English language, is coming along nicely.
"I can tell I am improving a lot through training sessions with my team-mates," he told Arsenal's official website.
"I am also getting used to expressing myself to them without hesitation.
"I was too shy and nervous when I first joined the team. Now I feel more settled living in this environment.
"Arsenal found an English teacher for me. I suppose I am improving [because] I can understand what the coaches are saying."