Japan has many different airsoft stores, both physical and online only. We have added the well-known stores in alphabetical order and a brief explanation from our experience of visiting there.
In addition to this, Defrowe Airsoft has made a very detailed tour of Akihabara he calls, Akihabara Gun Shop Walking Tour. Take a look to find details on shops in Akihabara that Defrowe has visited.
Repmart
3F Sakai Building 6-14-2 Sotokanda, Chiyoda City, Tokyo 101-0021
Opening Hours: 12:00 - 20:30 (7 days a week)
Airsoft97
110-0005 Tokyo, Taito City, Ueno, 3 Chome−19−4 3F
Opening Hours: 12:00 - 20:00 (7 days a week)
41PX
B1 Sakai Suehiro Bldg 6-14-2 Sotokanda, Chiyoda-ku 101-0021
Opening Hours: 12:00 - 19:00 (7 days a week)