/jp/ - Otaku Culture

Probably this game is the closest online mahjong we can get that resembles Saki game, without actually having Saki characters. Unlocking characters, special stories, and bullshit requirements to unlock achievements.

However, the online mode is quite close to Tenhou. Rating system (but without rank), similiar house rule, just without tenpai renchan, only agari renchan. Plus, you can get surplus coins if you get 1st.

That being said, personally I won't recommend this game if you want serious game like Tenhou. If you want to play, just grab characters, especially the broken ones, play CPU mode, then go ham.