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After Gravity Falls ends, Mabel and Dipper return home. But not all is well. Dipper, still scarred and haunted by Bill and the demon's actions, has now been declared mentally ill by his family. Not even Mabel defended him, much to his surprise and horror.
Due to his already fragile state of mind, this act of betrayal broke him. Dipper then tries to end his life a month later, but is stopped by a police officer. He is then sent to a mental hospital. It was later recealed that he was unable to leave due to his family disowning him. Life there was not pleasant. It was filled with overly sweet nurses and gruff doctors, none of them truly caring for him. That is until he meets Dr. Mori.
Unlike the other doctors, Dr. Mori actually cared for him, albeit a bit too much, but he still cared. Mori then gave Dipper an offer: Let the doctor adopt him, and they can return to Yokahama, Japan, where Mori resided. Or Dipper can stay at the hospital and perish under the other doctor's care. He went with Mori, and as if it was always the truth, he became Dazai Osamu, almost as if he never was anyone else.