Seems little bit weird but actually there are demands in this country. Manabu Koga videographer released monthly magazine Suichu Niso "A Kawaii Moe girl(s) and knee socks underwater". If you like it you can buy direct from Japan through amazon.co.jp here under. If this is the first time to buy, see “How to amazon.jp”, “How to Rakuten” on the right side. But maybe don’t need to because it is easy to do.
Suichu Niso on Pinterest
To help you to buy stuff direct from Japan through Japan's largest and well known online shop Rakuten and amazon.jp