Leonardo Watch is the main protagonist of the anime series 'Kekkai Sensen' (Blood Blockade Battlefront). He is a kind-hearted young photographer who moved to Hellsalem’s Lot, a city formed after a portal connecting Earth to the Beyond opened. In an unexpected turn of events, Leo receives the 'All-Seeing Eyes of the Gods,' a powerful gift that grants him extraordinary vision, but at the cost of his sister’s eyesight. He joins Libra, an organization dedicated to maintaining balance between the human world and the otherworldly creatures. Leo's journey is filled with challenges as he learns to harness his new abilities while preserving his humanity.