Moshi Tsuyoku Nareru Riyuu wo Shiri SugitaraNewもし強くなれる理由を知りすぎたら; What If I Knew Too Much About the Reason I Could Become Strong

What if Tanjiro had witnessed his family's massacre from the start? After Muzan's attack costs him an eye and an arm, Tanjiro takes a darker path to becoming strong. A dark-comedy fan-comic crossing Demon Slayer with Berserk.