The Foxes signed the prolific international striker after a two-year spell with Mainz.
Okazaki scored 14 goals for mid table Mainz last season, and his two seasons at the club were his strongest during his five-year spell in Germany. The forward also has an impressive 43 goals in 92 matches for Japan.
He is the Foxes third signing this summer after Christian Fuchs and Robert Huth on Thursday, emphasising somewhat of a German slash Bundesliga influence on Nigel Pearson's signings.
The 29-year-old was delighted to realise a life-long ambition of turning out in the Premier League, and joins Maya Yoshida of Southampton as the division's Japanese representatives.
"I will do my best to show how I can play and try to make a lot of goals for the supporters."
Leicester fans were certainly excited by the deal, and took to Twitter to share their opinions on Friday night:
@okazakiofficial Shinji Okazaki signs for Leicester City from Mainz. A useful addition for Nigel Pearson, needs to settle in quick.— Scott Smith (@scotty2smithy) June 27, 2015
Shunji Okazaki have signed for Leicester City and with Vardy,The Foxes have two forwards who will cover every blade of grass out there...— Firdauz As'at (@Furudeusu) June 27, 2015
Whoa, just saw Okazaki left Mainz for Leicester. That's a great signing! Leicester has done some great business this summer!— Eric (@EMcLean1982) June 27, 2015
The prospect of Okazaki & Kramaric up front next season is an exciting one. Our attack now is extremely decent for a side like us #lcfc— Tom. (@tommmjennings) June 26, 2015
Okazaki, Kramaric, Vardy, Ulloa & Nuge for next season then with Wood to leave. More than decent attack #LCFC— Joe (@JoeBerridge96) June 26, 2015