Invincible Saint Legend of Rainstar, also known as Seija Musou Rainstar Monogatari in Japanese, is a captivating web novel that follows the tale of a protagonist who, against their will, transforms into a renowned healer known as Rainstar. The story delves into the protagonist's unexpected journey from an ordinary individual to a healer of legendary status, all before the emergence of Luciel. Filled with adventure and fantasy elements, this novel appeals to readers interested in immersive and engaging narratives within the genres of adventure and fantasy, with tags such as healers and R-15 enhancing the unique storytelling experience.