The highly-rated youngster, who spent last season with Bolton, has joined Roberto Martinez's side with a view to continuing his development
The 19-year-old spent the second half of last season on loan at Bolton and has previously enjoyed a temporary spell at Feyenoord.
And he revealed the Gunners were eager to send him to a Premier League rival in order for him to continue his development.
Speaking to reporters, he said: "Arsenal talked about wanting me to go to Wigan and get some playing time, and so I consider this to be an important year for me as a player. I want to leave results that people will notice."
|31/20||Wigan are 31/20 to be relegated next season with Sportingbet|
"When I emailed Ali [Al-Habsi] to let him know we'd be on the same team, he tweeted 'Ryo's coming!' before the announcement. I was a bit shocked!
"But since I have that sort of close friend on the team I hope I can blend well with my team-mates and make it a good year."
The Japanese international scored once and got two assists in 14 appearances at Bolton last season.