Everyone in Japan knows Brown, the laid-back bear, and Cony, the bunny whose wild enthusiasm makes Brown seem even more chilled. They make a good pair — they’re dating, you see — and they also make a lot of money for their owners. They’re virtual stickers inside Line, a messaging app that now dominates Japan.

The cute characters in Line’s stickers — next-level emoji, basically — are hugely popular outside the app itself, with ubiquitous merchandising that’s impossible to ignore. Though it doesn’t disclose profit, the company reports impressive revenue growth off the back of sticker sales and in-app purchases from its gaming service. The app had over 450 million users worldwide as of June, with CEO Akira Morikawa targeting 1 billion by next year. It’s available on pretty much every platform imaginable.

And now Line is gunning for Americans.