18+ Suterare Ouji ga Saizensen de Tekikoku no Heishi wo Chiryou shitara Jitsu wa Dainana Oujo Datta Ken

Reincarnated from modern Japan as Reischel, the First Prince of the Kingdom of Agarham, the protagonist receives a supernatural power that allows him to heal any anomaly just by touching it. Following his father's death, Reischel is removed from his position as Crown Prince due to his younger brother's rebellion and is sent to the battlefront. Nonetheless, he spends his days healing wounded soldiers, both allies and enemies, and gradually establishes himself as the respected commander of the medical corps. One day, he treats a soldier who is on the brink of death, but that soldier turns out to be... ?! An intensely dramatic and slightly erotic isekai harem life begins!

(Source: Kadokawa, translated)