Love Apartment: Lying down makes me happy

No system, slice-of-life story, no harem, single female lead. The female lead will be decided later; she might be from the original work or someone who has appeared in the story. A simple-minded person unexpectedly transmigrates to another world, arriving at this place where flower petals drifted by. From then on, they live a carefree life, making a group of friends in the process. ...