Jin Young Ko wins the tournament by two strokes over Nelly Korda, with Ayaka Furue and two others one shot further back in Singapore.
The Kobe native finished two shots off the pace after entering the final round in a three-way tie for the tournament lead in Portland, Oregon.
“I am both frustrated and happy to get a result like this on this difficult and wonderful course," said the golfer known as "Smiling Cinderella."
The 22-year-old Kobe native captured her first LPGA Tour title with a career-best round in a come-from-behind victory.
Fittingly, the Argentine legend scored the first goal in the French club's tour-opening win over Kawasaki Frontale.
The Swallows third baseman and Buffaloes hurler received top vote totals in the Central League and Pacific League, respectively.
Inami has won four of the eight JLPGA Tour events since early March, including last weekend's Fujisankei Ladies Classic.