Enaga Yuuki

One day, an ordinary young man is handed an unexpected gift by a beautiful girl: an "Isekai Reincarnation Ticket." Before he knows it, he awakens as Rufus, a prince in another world! In this new world where everyone possesses unique skills, Rufus is granted the Summoning Skill—a rare and powerful ability. Rather than chasing glory or power, Rufus dreams of a laid-back life surrounded by adorable, fluffy magical creatures. With his summoning powers, he sets out to master the art, building a cozy, adventure-filled life in a world full of magic, mysteries, and mochi-like cuteness! Source: MangaUpdates

Me, who has mastered the game profession of "magic medicine doctor," was reborn in a miserable world where the only medicine available was a grotesque recovery potion! Reincarnate as a child of a noble family and save the world by secretly improving magic potions. If you create not only medicines but also various other things, you may be thanked by your cute little sister and everyone in the territory!