Assalamualaikum,
For those of you visiting Osaka through Kansai Airport, Alhamdullilah Kansai Airport has Muslim Friendly Facility. They provided 24Hours prayer room for Muslim visitors. The rooms divided for man and woman, they have complete facility for this, from ablution place to prayer dress for woman.
There are 3 prayer space within the airport Terminal 1 Building, in 3F, International Gate Area North Wing and International Gate Area South Wing.
Please check the link below on How to Find Prayer Room in Kansai International Airport
http://jhtv.jp/movie/find-prayer-room-kansai-international-airport-osaka