Isekai Munchkin: HP1 no Mama de Saikyou Saisoku Dungeon Kouryaku

In a world subtly interwoven with the fantastical, sixteen-year-old Yukito Kirihara’s life is defined by his protective devotion to his younger sister, Sana. Their quiet existence shatters when an otherworldly being appears, seeking Sana's presence and triggering a devastating event for Yukito himself. Offered a chance at reincarnation by an enigmatic figure, he awakens with an unusual guide: a book detailing his new existence as if it were a game. The guide reveals that Sana has also been touched by this strange occurrence. Armed with minimal resources – a single hit point – Yukito embarks on a perilous journey to locate and safeguard Sana, navigating a world where fate and chance appear to be his only allies against unforeseen threats. The series explores themes of familial bonds, sacrifice, and the nature of existence within a uniquely structured framework.