The official Kojima Productions store has added a new product: high quality iPhone cases made by GILD Design. There are versions for five different iPhone models, 5, 6, 6Plus, 7 and 7Plus). They don’t come cheap though, with prices ranging from 11000 to 12000 Yen (over 100 USD).
iPhone 5 / 5S / 5SE
iPhone 6 / 6S
iPhone 6Plus / 6SPlus
You can order your own via this link. They will ship next month.