The Japanese international, who signed on Tuesday and was paraded at half-time in the 4-0 win over Brighton, can't wait to get started.
He said: “It’s always been a dream of mine to play in the Premier League. It’s physically and technically a top league and very intense, so I know it’s going to be difficult but I’ll give my all for the team.
“My strengths are heading, one-versus-one situations and I like to do a lot of running. I’ve only scored twice this season, but I want to score more. I can’t wait to celebrate in front of the Luton supporters.
“I’m so happy to be joining and I can’t wait to play as soon as possible.”