"Make My Day" is a science fiction anime series set in a distant future where humanity has colonized a frozen planet called Coldfoot. The story revolves around the struggle for survival in this harsh environment, where the planet's native creatures, known as Snow Devils, pose a constant threat to human settlements. The narrative centers on Jim, a young man who becomes entangled in a larger conflict after his mining colony is attacked by the Snow Devils. Jim discovers that these creatures are not merely mindless predators but are connected to a deeper mystery involving the planet's ecosystem and humanity's exploitation of its resources.

As the story progresses, Jim joins forces with a group of survivors, including a skilled fighter named Roy and a scientist named Tina, who is researching the Snow Devils. Together, they uncover the truth about Coldfoot's history and the origins of the Snow Devils, which are tied to a failed terraforming project that altered the planet's environment. The group faces numerous challenges, including internal conflicts, the relentless Snow Devils, and the machinations of a powerful corporation seeking to control Coldfoot's resources. The series explores themes of survival, environmental exploitation, and the consequences of human ambition, all while maintaining a tense and action-driven narrative. The characters' development is intertwined with the unfolding mystery of the planet, creating a cohesive and engaging storyline.