Clan Senki is an upcoming 8-bit MMORPG by DMM Games. The game can be played on any PC web browser and smartphones as well. DMM Games is known for anime games like Infinite Stratos: Archetype Breaker and Kanpani Girls which are also playable on the web browser.
Like any MMORPG, the game features Guilds, Parties and a Market System. However it’s said to be a casual MMORPG where one can easily enjoy and not work too hard on it. Currently there’s a pre-registration event ongoing now which will reward players based on the pre-register milestone.
For more info, you can check out their official website!