Succubus ni Tensei shita node Milk wo Shiborimasu

Succubi are legendary beings who drown men in intoxicating pleasure, haunting their dreams with visions of loved ones. Seventeen-year-old Riichi Hourai never expected to become one, but a clerical error by the Reincarnation Support Department following a fatal accident leaves him reborn as a succubus in another world. To survive, a succubus must drain and consume male life essence—a practice the former human boy adamantly refuses, choosing death over such predatory behavior. Fortunately, an unexpected substitute exists: milk. Because dairy cows do not naturally exist in this realm and consuming another race's milk is unheard of, the department grants him a special bovine companion. Now, Riichi risks everything to raise his lifeline, desperately fighting his innate succubus urges while striving for a quiet existence. However, his dream of a peaceful life quickly unravels. The cow he was given harbors secrets far beyond those of an ordinary creature, dragging him into grand conflicts that shape the very fate of the world. Complicating matters further, Riichi’s best friend also perished in the same accident and was reincarnated shortly after him, yet neither is aware of the other's presence in this new reality. As both navigate unfamiliar lives armed with powerful cheat abilities, the question remains whether they will ever reunite and if their bond can survive across lifetimes. A chaotic romantic comedy begins as two friends unknowingly chart their intertwined destinies.