What if you take a pill to sleep well, but wake up in another world? Everything will be perfect for Nata, if she maintains her excellent results this school year, and fulfills her father's wish: to be the best, to replace her spoiled brother. However, strange dreams caused her to have trouble sleeping, severely lose concentration, and eventually receive the worst grade in the school's history. In desperation, Nata turns to Libo, a drug that helps control dreams, regaining inspiration from beautiful memories, without knowing the cost of it. Will she be able to escape the troubled dream world that the pill brings, not only affecting her mother and brother, but also destroying everything in the real world that she holds dear? Open "Light On" today, to find the answer.