Game Kaishi Mae ni Shini Mob Akuyaku Ouji ni Tensei shita Ore

Alternative

Gemu Kaishi Mae ni Shinu Mobu Akuyaku Oji ni Tensei Shita Ore ~Oshi Hiroin no Imoto to Shiawase ni Naru Tame ni Saijaku Maho [Yamijin] o Kajona Doryoku de Kiwamenuitara, Saikyo no Bukkoware Seino to Kashiteita Ken~; ゲーム開始前に死ぬモブ悪役皇子に転生した俺 ～推しヒロインの妹と幸せになるために最弱魔法【闇刃】を過剰な; I Reincarnated as a Mob Villain Prince Who Dies Before the Game Even Starts ~In order to be happy with my favorite heroine's sister, I excessively mastered the weakest magic, [Dark Blade], and it ended up becoming the strongest, most broken magic~ ; Game Kaishi Mae ni Shinu Mobu Akuyaku Ouji ni Tensei shita Ore: Oshi Heroine no Imouto to Shiawase ni Naru tame ni Saijaku Mahou "Yamiba" o Kajou na Doryoku de Kiwamenuitara, Saikyou no Bukkoware Seinou to natteita Ken ; Game Kaishi Mae ni Shinu Mob Akuyaku Ouji ni Tensei Shita Ore ~Oshi Heroine no Imouto to Shiawase ni Naru Tame ni Saijaku Mahou [Dark Edge] wo Kajou na Doryoku de Kiwamenuitara Saikyou no Bukkoware Seinou to Kashiteita Ken~ ; Reborn as the Mob Villain Prince Destined to Die Before the Game Begins: I Turned My Weakest Magic [Dark Edge] Into the Most Broken Skill Through Sheer Effort ; ゲーム開始前に死ぬモブ悪役皇子に転生した俺　～推しヒロインの妹と幸せになるために最弱魔法【闇刃】を過剰な努力で極め抜いたら、最強のぶっ壊れ性能と化していた件～