Kimi wo Shitte Hana ni Naru

That awful day... that's when I met her. Rui was born as a mage. Mages are known to have much shorter lifespans and can turn other people into mages by directly touching them. Because of the dangers associated with mages, they're not looked upon too kindly in modern society. One day, Rui comes across a clumsy girl named Ema. Reaching out to catch her as she falls, Rui accidentally turns her into a mage. From that day on, the Rui has found himself to be changing by the day...! (Source: MangaPlaza)