I believe our MC sng 'Killer Queen' based on the giant lady robot prop, and how the sung was described as difficult.
Fluffy Wholesome Stories
1. Hero's Diner
2. My Dad is too Strong
3. Solo-farming in The Tower
4. Isekai mofumofu Café
5. The Gourmet Gamer
1. Hero's Diner
2. My Dad is too Strong
3. Solo-farming in The Tower
4. Isekai mofumofu Café
5. The Gourmet Gamer