Yomei Hantoshi to Senkoku Sareta node, Shinuki de [Hikari Mahou] wo Oboete Noroi wo Hodokou to Omaimasu.  

I Only Have Six Months to Live, So I’m Gonna Break the Curse with Light Magic or Die Trying, 余命半年と宣告されたので、死ぬ気で『光魔法』を覚えて呪いを解こうと思います。

You are given just six months to live. You are the third prince Carus, who carries a curse on your left breast. At ten years old, you are told of your impending death. This news causes you great despair. However, your life takes a turn when you encounter the sage Gori. As his apprentice, you learn about light magic which can remove curses and banish darkness. Blessings often come hand-in-hand with curses. In your case, the powerful curse that afflicted you also granted you immense magical abilities, allowing you to see spirits that are invisible to normal people. Despite this, you continue to grow at an incredible rate. This is a tale of bravery and resilience of a young boy who faced death but emerged victorious through blessings.