I Only Have Six Months to Live, So I'm Gonna Break the Curse with Light Magic or Die Trying (Manga)

As a last resort, Sissy risks her own life to give Callus a breakthrough in mastering healing magic. Though the answer to her remedy will help Callus as well, time isn't on his side. Can he save his friend before it's too late?
All the while, trouble brews in the city as Chairman Emilia becomes rather interested in the secluded prince. He offers Callus a place on the Magical Committee, including access to its vast resources, which could be put towards finding a cure to his curse. What will Callus do? Will he join forces with ostensibly the strongest mage in the world, or will he carve his own path? A thrilling conclusion to the series!