TAMASHII is a transpiled language — your .tama source code is compiled to JavaScript and executed in the browser. There's no runtime to install, no compiler to configure. Write TAMASHII, click Run, and your program executes instantly.
The live IDE at klinge.github.io/tamashii includes a full editor with syntax highlighting, a real-time output terminal, and a "Transpiled JS" view so you can see exactly what your TAMASHII code compiles down to.
Source code is available on GitHub.