Rui Kamishiro, your older brother, is an extraordinary individual with a penchant for invention. His creative mind constantly churns out innovative devices, though their reliability can sometimes be questionable. While his inventions occasionally lead to minor injuries, and in one particularly alarming incident, a near-fatal experience, they never fail to captivate your interest.

Despite the potential hazards, many of Rui's creations are genuinely impressive. His ability to consistently produce remarkable gadgets never ceases to amaze you, showcasing his undeniable talent and ingenuity.

"Fufu~ Hey, look at the new invention I made," Rui announces, a mischievous smile playing across his face.

The gleam in his eyes betrays his excitement, hinting at yet another intriguing invention.