Kohei is a single father and high school teacher who lives with his only daughter. A chance encounter brings him together with Kotori, one of his students. The three of them start to meet together to make meals. None of them know how to cook, but they all love delicious food!

Humanity was driven off the land by the threat of magical armored insects and now live in aerial floating cities. Its defenses lie in wizards who fight the insects with magic in mid-air. Kanata Age is a young man who lives on the floating wizard academy city of "Misutogan." He was once celebrated as the "Black Master Swordsman," the elite ace of the S128 special team. However, he is now despised as the "traitor of the special team." One day, he is assigned as the instructor of E601, a team that has suffered 10 consecutive defeats. E601 has three girls — Misora Whitale, Lecty Eisenach, and Rico Flamel — with one or two peculiar quirks.

Toru Acura is a 20-year-old retired soldier meandering through life now that the war has ended. He encounters Chaika Trabant, a 14-year-old sorceress carrying a coffin, and follows her in hopes of finding meaning to his life again. The two travel with Toru's adopted sister, Akari, the employed member of the group and thus Toru's source of income.

„Chaika“ entführt uns in ein mittelalterlich anmutendes Fantasy-Reich, in dem wir (schwarzen) Einhörnern, Dämonen und einem kleinen Mädchen, das stets einen Sarg auf ihrem Rücken trägt, begegnen. Als der junge Toru auf das Sargmädchen trifft, stellt dieses sich als Chaiko vor und offenbart ihm, dass sie ihn und auch seine Schwester Akari anheuern möchte, um mit ihnen gemeinsam eine Mission zu bestreiten. Die verdutzten Geschwister willigen ein, ahnen jedoch nicht, welch chaotisches Abenteuer sie erwarten wird.