Nanashi greeted him with a smile, “Yo Sousuke! Glad you could make it!” He said before looking down. “Oh, and you even brought a friend that's fantastic!” He said, addressing Natsu who had been out of Sousukes line of sight. “This is fantastic, don't be shy both of you!” He said as he grabbed both their arms and dragged them into the room. Quiet forcefully he might add. 

“Now then! Honestly I hate how boring most introductions are so I think we should start this off with a quick battle! I think it would be a great idea to get a good feel for each others fighting styles and machines while also showing our stuff, eh?”

Nanashi then pressed a few buttons on the battle system, causing plavasky particles to float into the air. “Plavasky particle dispersion. Damage Level C. Area, Mountains 1. Begin!” The machine said as an area that looked like Mount Fuji with a river at its base was created. 

Nanashi took out his Gunpla, it was the white Origin Zaku Warrior but looked to be an upgraded version to some degree. “Now then,” he started as he put down his terminal, his name and Gunplas name popping up. “Nanashi Kanzen, Origin Zaku Phantom, Execute!!!” He yelled as the Gunpla drew breath, launching forward and flying through the area. 

“The name of the game is Free for all! Last man standing is the winner!” He said with a chuckle as he grabbed the controls.