I was reincarnated as an extra who briefly appears as a villain in the beginning, and who is also the fiancé of the sub-heroine. Despite thoroughly disciplining myself and maintaining a harmonious relationship with my fiancée, the sub-heroine, she still went to the protagonist's side. The main story is now complete! Thank you. The long-term side story is also complete. Thank you very much!! ※The cover and insert illustrations were created using Novel AI. These illustrations are available for commercial use. ※There are descriptions at the beginning that may remind readers of NTR. While not related to the heroine, please be cautious as some readers may find it unpleasant. ※The early parts of the story may seem implausible and difficult to understand. These elements are necessary for the plot development, so please read the announcements.