Takeshi Yamano

Takeshi Yamano is the biological older brother of Mitsunami, who lost his life in an accident alongside their parents before the events of the story unfold. Though no longer among the living, he frequently manifests within Mitsunami's mind as memories or hallucinations, drawing upon his extensive knowledge of otaku culture, military affairs, and survival techniques to guide her in forming strategies for survival and entrepreneurship in another world. He serves as her most significant source of spiritual and intellectual inspiration.