senjuushi:_the_thousand_noble_musketeers
Prequel to Senjuushi: the Thousand Noble Musketeers Rhodoknight. Mobile RPG by Line Corporation and Marvelous! Entertainment. The game involves male personifications of matchlock firearms, drawing from the tanegashima of 16th century Japan as well as firearms from foreign countries.
The main character artist is Kinoshita Sakura.