The Gunners signed the Japanese striker from Sanfrecce Hiroshima in July before sending the 21-year-old to VfB Stuttgart on a season-long loan but he is expected to bring plenty of quality back to North London when he returns.
Wenger told Arsenal Player: "What I see in him is the quality of his runs, his pace, his body strength and he is quite aggressive.
"You do not find many players today who go behind the defenders at every opportunity.
"That is one of his strengths. I must say, I'm personally a strong believer in him, because by coincidence I met the national coach of Japan and he is absolutely convinced by him."