MOAstray — Through the damp gloomy darkness, one can hear the eerie sounds of giant machines. At the advanced facility, captured by alien animals and locals, a fully automatic system controlled by the host computer still works like crazy. Awakening in an abandoned laboratory, the green, ambiguous form of life of the MO reveals that it not only encounters an extremely hostile and ominous environment, but also with people who, being trapped by alien parasitic plants, are now trapped in an endless eruption between deaths. Moreover, there seems to be a macabre presence that watches all of this out of the shadows. After searching for clues, the MO gradually realizes that it is responsible for the mission of great importance. Under the guidance of mysterious murmurings on the ear of the MO, one obstacle after another can overcome.