The TS Reincarnate Wants to Live Happily in Another World!

I wish my gender would change. A boy with a mysterious constitution once thought of something, and his imagination became reality. When he wakes up, he's a young girl—hello, alternate world. With no one around, no one knowing, and only a single spell to his name, he tries to begin a slow life. However, things don't go as planned; his constitution proves to be a constant hindrance. He must interact with people to prevent it from spiraling out of control. But unfortunately, his starting point is an empty house with no one around. Will the protagonist overcome his constitution and enjoy a normal life? Or will he be defeated and fall down a twisted path? A tale of adventure in an alternate world by a boy who underwent a gender-change reincarnation. Or something close to a slow-life story.