OVA
Description
Io Naruko is a second-year student at Binan High School and a core member of the Earth Defense Club. Born on December 17, he has A-type blood and stands 178 centimeters tall, making him the third tallest in the club. His appearance is marked by pale green, collar-length hair and light gray eyes, a look that complements his composed and refined demeanor.
Personality-wise, Io is defined by a resolute pragmatism, anchored in a conviction that financial success underpins existence. His personal motto is that money is everything in the world, and he views most situations through the lens of profit and efficiency. This philosophy drives his unusual pursuits for a teenager, as he is highly skilled in foreign exchange trading and investment, having amassed considerable wealth. His interests include managing these assets, while his favorite food is the affordable and popular beef bowl, gyudon. He is generally level-headed and analytical, often being the one to prioritize a monster threat over distractions during a crisis. Despite his cold and calculating surface, Io expresses himself with extreme politeness, always using formal language. He also has a perfectionist streak, disliking inefficiency and detesting when others touch his personal belongings.
In the story, Io serves as the pragmatic anchor of the Defense Club, often managing logistics or offering a rational viewpoint. His behavior is heavily influenced by his key relationships, most notably with his classmate and best friend, Ryuu Zaou. Their bond is exceptionally close, to the point that they address each other by their first names. While their friendship began with considerable friction due to their differing values, it has since evolved into a deep mutual respect. The dynamic carries a layer of romantic tension, as seen when Ryuu gives Io chocolates on Valentine's Day, causing the usually flustered Io to blush deeply as he accepts them. Io also demonstrates a protective instinct toward Ryuu, such as when he rejoined a battle only after seeing his friend in danger. Io is also the object of interest for student council member Akoya Gero, who frequently tries to recruit him.
When transformed, Io becomes the Roaring Prince, Battle Lover Sulphur. His battle regalia is a frilled yellow and white prince costume, and he wields a weapon called the Raging Gaia love stick. His assigned element is earth, represented by the color yellow. His individual attacks include Sulfur Gaia, where he projects yellow light projectiles, and its upgraded form, Sulfur Love Gaia, which manifests as yellow lightning. He is also a key participant in team finishers like the True Love Attack.
Throughout the series, Io undergoes notable development that softens his purely monetary worldview. In the first season, he considers leaving the Defense Club to become treasurer for the student council, a move that deeply hurts Ryuu. However, upon seeing Ryuu struggle alone in battle, Io returns and defeats the monster in a single strike, reaffirming his loyalty to his friends over profit. The second season introduces a new transformation bracelet and a major argument between Io and Ryuu that threatens the team's cohesion. Even while claiming not to have reconciled, the two are able to execute devastatingly coordinated attacks, proving their bond is stronger than their disagreements. While his full background remains unexplored, Io consistently serves as the Defense Club's unwavering pillar, balancing his financial acumen with a growing emotional openness, particularly in his relationship with Ryuu.
Personality-wise, Io is defined by a resolute pragmatism, anchored in a conviction that financial success underpins existence. His personal motto is that money is everything in the world, and he views most situations through the lens of profit and efficiency. This philosophy drives his unusual pursuits for a teenager, as he is highly skilled in foreign exchange trading and investment, having amassed considerable wealth. His interests include managing these assets, while his favorite food is the affordable and popular beef bowl, gyudon. He is generally level-headed and analytical, often being the one to prioritize a monster threat over distractions during a crisis. Despite his cold and calculating surface, Io expresses himself with extreme politeness, always using formal language. He also has a perfectionist streak, disliking inefficiency and detesting when others touch his personal belongings.
In the story, Io serves as the pragmatic anchor of the Defense Club, often managing logistics or offering a rational viewpoint. His behavior is heavily influenced by his key relationships, most notably with his classmate and best friend, Ryuu Zaou. Their bond is exceptionally close, to the point that they address each other by their first names. While their friendship began with considerable friction due to their differing values, it has since evolved into a deep mutual respect. The dynamic carries a layer of romantic tension, as seen when Ryuu gives Io chocolates on Valentine's Day, causing the usually flustered Io to blush deeply as he accepts them. Io also demonstrates a protective instinct toward Ryuu, such as when he rejoined a battle only after seeing his friend in danger. Io is also the object of interest for student council member Akoya Gero, who frequently tries to recruit him.
When transformed, Io becomes the Roaring Prince, Battle Lover Sulphur. His battle regalia is a frilled yellow and white prince costume, and he wields a weapon called the Raging Gaia love stick. His assigned element is earth, represented by the color yellow. His individual attacks include Sulfur Gaia, where he projects yellow light projectiles, and its upgraded form, Sulfur Love Gaia, which manifests as yellow lightning. He is also a key participant in team finishers like the True Love Attack.
Throughout the series, Io undergoes notable development that softens his purely monetary worldview. In the first season, he considers leaving the Defense Club to become treasurer for the student council, a move that deeply hurts Ryuu. However, upon seeing Ryuu struggle alone in battle, Io returns and defeats the monster in a single strike, reaffirming his loyalty to his friends over profit. The second season introduces a new transformation bracelet and a major argument between Io and Ryuu that threatens the team's cohesion. Even while claiming not to have reconciled, the two are able to execute devastatingly coordinated attacks, proving their bond is stronger than their disagreements. While his full background remains unexplored, Io consistently serves as the Defense Club's unwavering pillar, balancing his financial acumen with a growing emotional openness, particularly in his relationship with Ryuu.