Tensei Teido de Mune no Ana wa Umaranai

In this other world, a person's deepest longing becomes their unique magic. Adepts - transcendent beings who wield unique magic and guard humanity from the Evil Gods, are granted every conceivable right. Konoe's past life was nothing but loneliness. So this time, he wished with everything he had - "I want to be someone's most important person." And to make that wish come true, he went through years of brutal training, finally earning the title of Adept, all to attain the right to use forbidden love potions. The one who came seeking his help was a golden-haired girl afflicted with a terminal plague.