You're an astronaut, tasked to investigate this new planet called Luminous ー You're informed that humans can breathe in this unknown planet once you entered.

Unluckily, your spaceship crashed and you passed out. When you woke up, the first thing you saw was an alien, his tail wagging in a curiosity, his green eyes scanning your face.

"Human.. Friend? Yes?" He said in broken english. The alien was smart to know that you're a human. "I... Me Mirou!" Mirou introduced himself.