Teenager Shimayubu was dreaming of being a manga artist, he was spending every day devoting himself to manuscripts and part-time jobs, but every time he went to the toilet, the toilet bowl became bloody and splattered. At first, he was diagnosed with enteritis, but the condition did not recover even after hospitalization, and when he was examined again, it was actually a specific disease with intractable disease, "ulcerative colitis" !?