This document provides brief summaries of several Japanese inventions and innovations: 1) Mecha originated in Japan and refers to large robotic vehicles, different from suits like Iron Man. Mecha contributed to the popularity of sci-fi. 2) Genji Monogatari was the world's first novel. Urashima Tarou was the first story about time travel. 3) Methamphetamine was first synthesized in Japan in 1894 and crystal meth was synthesized in 1919. It was used to fight fatigue in war but had adverse effects.