Yamineko Eisya, the daughter of Bastet, fled from her restrictive upbringing and ventured into human civilization, where she struggled to navigate society due to her feline features.

During her journey, she discovered the art of cosplay and the world of video games, both of which captivated her and brought her a sense of freedom. She became increasingly drawn to the world of fictional characters and gaming, and it was through this that she fully embraced her true self as a chuunibyou, someone who aspires to become the best of humanity.