See the original story in Japanese. Tokyo-based Donuts, a mobile game developer and the creator of the video app MixChannel, announced today that it has invested an undisclosed sum in Nagisa. Details of this investment were not disclosed but it appears to be worth about $1 million according to Nagisa’s corporate profile and past funding history. Launched back in 2010, Nagisa operates a messaging app called Balloon, and previously raised 100 million (or about $1 million) from Nissay Capital. Subsequently, they also produced the photo effects app Kame Camera, the diary app Livre, and a virtual idol app The 49th Girl — all of which have surpassed five million downloads cumulatively. The company also tells us that their movie app Slide Movies has acquired over 700,000 downloads in the two months since its launch back in December, and its monthly downloads surpassed 1 million in April alone. The company’s CEO Yoshiyuki Yokoyama told us that they are planning to expand their business to other sectors including C2C (consumer-to-consumer), fashion e-commerce, and games, thus making the most of their rapidly growing user base. As an investor, Donuts is interested in that user base, and is exploring synergy around Donut’s hit movie…