Gift Hisono is a painfully gifted painter whose artistic ambition is constantly overshadowed by financial ruin. As he teeters on the brink of completing his latest masterpiece, his essential palette knife snaps, leaving him unable to finish his work and too broke to afford a replacement. Driven to desperation, the struggling artist makes a calculated but morally devastating decision: he steals paint from Taima, a close friend and fellow member of their school's art club. This singular act of theft, however, does not go unnoticed. Another club member, Kadomi, witnesses everything, and this moment marks the beginning of Gift's poisonous downfall.

What begins as a quiet crime of poverty quickly metastasizes into a harrowing psychological thriller set within the insular and competitive world of a high school art club. The initial narrative thrust is propelled by the tension of Gift's secret and the pressure of Kadomi's silent knowledge, which quickly becomes a tool for manipulation and psychological torment. Instead of experiencing relief, Gift finds himself trapped in a web of paranoia and escalating harassment as his transgression is used against him. The very creativity that defines him becomes a source of anguish, and his art begins to transform, reflecting his inner decay and madness rather than simple beauty. The series tracks Gift's complete unraveling as his desperate attempts to protect his reputation and salvage his passion only serve to poison his relationships and his own psyche further. The story is a compact, three-volume descent into chaos, concluding on September 19, 2024, with a final, corrosive resolution to Gift's poisonous gift.