Henkyo No Maho Kusushi Jiyu Kimamana Isekai Mono Zukuri Nikki 1 (MF Books) [Light Novel]

[Machine Translation] One day, I was asked by a goddess to "reform the magic potions in my world," and when I was reborn, I found that nightmarish magic potions of "the lowest quality," "grotesque," and "no longer poisonous" had infested the world! I was reincarnated as Julius, the third son of a frontier family, and started reforming magic potions by utilizing my gaming skills from my previous life. Meanwhile, my sister Rosalia, who is naturally dexterous by nature, begs me to create magical tools at will, and before I know it, I'm the talk of the town...? The heartwarming magic potion reform of Julius, a reincarnated man who loves making things, begins!

ある日女神に「私の世界の魔法薬を改革してほしい」と頼まれ転生すると、そこでは「最低品質」「ゲロマズ」「もはや毒」の三拍子が揃った悪夢のような魔法薬がはびこっていた!辺境伯家の三男ユリウスとして転生した俺は、前世のゲームスキルを活かし魔法薬改革をスタートさせる。そのかたわら、元来器用な俺は妹のロザリアに請われるまま自由気ままに魔道具を作り出していると、いつの間にか巷で話題になっていて―?ものづくり大好きな転生者ユリウスのほのぼの魔法薬改革が始まる!