I read the same setting web-novel as this manga on Kakuyomu (it's also Yuri) , the only different is the one who got killed is the Demon Queen not the Heroine. In that story the Generals and the Demon Queen also aim for world domination. And the Heroine also has her memory of her past life and...
Angsty her work always has it but, most of them are happy ending so i'm not too worry about it. Even in Kimi Koi Limit, the ex-girlfriend has her own 2 chapters and found happiness too so im possitive about this.
What is so comical about this oneshot that it needs "comedy" tag? Slice of life? Are you kidding me??? Does that mean Mami's life is such a joke that it needs comedy tag? 😂