Asahi Ikusaba, an ordinary Japanese high school student passionate about RPGs and isekai tales, enters a coma after heroically saving a child from a vehicle. His consciousness awakens in a fantasy world mirroring his beloved games. Expecting overpowered hero status, he joins an adventurer guild only to discover severely limited capabilities: level one stats and merely a basic stone-throwing skill. Early monster encounters nearly prove fatal, starkly revealing his unpreparedness and unrealistic expectations.
Physically, he possesses brown hair, red eyes, and a medium build. Upon arrival, he sells his cell phone to acquire standard adventurer gear: a green sleeveless jacket worn over a black hooded sweatshirt and a white long-sleeved shirt, completed by brown pants, brown boots, and green gloves. This attire remains constant.
His personality blends energetic enthusiasm for RPG mechanics with pragmatic caution. Though possessing heroic instincts, he readily retreats from overwhelming threats. He upholds high moral standards, especially in rejecting unwanted advances. Initially cowardly against powerful foes, he gradually develops strategic thinking and resilience. Unintentional leadership emerges as he forms the "Superlegion Asahi," often serving as the sole rational member managing volatile companions.
His abilities include modest superhuman strength sufficient for basic monster combat but overshadowed by others. Magic use is constrained by finite MP, limiting sustained casting. Extraordinary luck enables improbable victories in dire straits. Over time, he gains practical skills like a light-emitting spell initially deemed useless; this later proves tactically valuable for disorienting foes. His combat reflexes and adaptability improve, evidenced by identifying enemy weaknesses and employing unconventional tactics against stronger adversaries.
Relationships define his journey. His older sister Maya Ikusaba deliberately induces a coma to join him, gaining immense power singularly focused on his protection. Her obsessive romantic fixation causes him distress, yet their partnership becomes foundational to survival. He maintains a facade as the "hero" responsible for Maya's one-hit kills, as revealing the truth risks execution for guild rank falsification. The demon general Kilmaria shifts from challenger to ally after his intervention spares her, developing protective instincts and eventual romantic feelings. This dynamic expands into a harem as other females—Gloria, Sophie, Kuon—join their party, creating comedic or tense conflicts. Unintentional hero status earns admiration from guild members like Tanya, complicating his reputation.
Character development involves incremental competence gains despite remaining the weakest party member. Early episodes showcase panic and reliance on others; later arcs demonstrate improved battle awareness, tactical environmental use, and leadership in coordinating allies. A pivotal duel against Gloria yields his first legitimate victory via strategic light spell use, marking a psychological turning point. His journey concludes confronting the Demon King's forces, leaving him and Maya stranded on a deserted island—a resolution emphasizing their enduring bond amidst continued displacement.