Bold font and japanese font name?

Lemon Milk  Suggérée par heypen 


Marugo Large Pr6N  Suggérée par heypen 
Source Han Sans Japanese  Suggérée par heypen 

for the sans serif (STARDUST)

It's also really hard to see the Japanese text clearly, but if you want one that has rounded edges...

and this one is more like a Japanese sans serif (not roundy)
it has many weight options