After the fall of Penacony's Dreamscape, Sunday is arrested, his future hanging by a thread. Desperate to save him, Robin makes a risky deal with Jade, begging the Astral Express to take him in. But can Sunday truly escape the chains of his past? Haunted by trauma, guilt, and a world that's moved on without him, Sunday's journey aboard the Express may prove just as perilous as the world he left behind.

Sunday thought it was just a normal sickness and nothing that much serious, he was trying to rest his mind after the fight with Fulwish. But to his nightmare, what would happen if his sickness is not truly good involved with Shuhu and Yaoshi of his unrequited love with the Data Bank archive guard. Now he must choose once, do his surgery, confess his real feelings or worse die in his journey. What decision will Sunday take? Or... Hanahaki Disease Sunheng, of a AU after 4.2 story and before the events of 4.3