"Saimin App de Yumeno Harem Seikatsu" is a Japanese light novel series that revolves around a protagonist who develops an app that can induce lucid dreaming. The story takes a turn when the protagonist discovers that the app not only allows users to enter their dreams but also brings people from the dream world into reality.
Avoid piracy sites. While a quick search for "-read saimin app de yumeno harem seikatsu chapter 1-" might lead you to aggregator sites, these hurt the author and artist, potentially leading to the series being canceled. Many official platforms offer the first chapter for free as a preview. -read saimin app de yumeno harem seikatsu chapter 1-