TV-Series
Description
Retto Enjō stands as the central protagonist. He possesses a slim build accentuated by a muscular physique, defined abdominal muscles, and short wavy red hair; his specific body measurements are bust 83 cm, waist 61 cm, and hips 83 cm. Driven by a powerful sense of justice, his core personality revolves around a fierce dedication to protecting others, especially those close to him. While not characterized as a pervert, the nature of his combat abilities frequently involves him in sexually charged situations.

A defining childhood trauma shapes his motivation: witnessing his close friend Kirara Hoshino attacked by an alien Censor Bug. This event caused Kirara to become emotionally distant and develop androphobia, creating a rift between them. Determined to prevent such suffering, Retto joined the Earth Defense Force's HxEros unit. Their mission combats the insectoid Censor Bugs, aliens that drain humans of "H-energy" – a vital force linked to libido and sexual passion – threatening humanity's survival through potential extinction via suppressed reproduction.

Relationships form a core aspect of his development. His bond with Kirara evolves from estrangement to reconciliation, culminating in a romantic confession and them becoming a couple. He maintains connections with his younger sister Hiro Enjō, his uncle Jō Anno (head of the Saitama Earth Defense Force), and fellow HxEros members Momoka Momozono, Sora Tenkūji, and Maihime Shirayuki. These relationships often involve accidental intimate encounters, such as Momoka falling onto him in compromising positions or Sora sleepwalking into his bed. He also interacts with a reformed Censor Bug named Chacha, who aids in building his H-energy, and his pet dog Runba.

In combat, Retto channels H-energy through specialized XERO gear technology, converting erotic energy into weapons against the aliens. A significant consequence of this power is the frequent unintended destruction of clothing during energy use, necessitating costume changes. He can also access a dangerous "Beast Mode," triggered when Chacha bites him, flooding him with excessive H-energy that erodes rational thought and increases aggression toward females. Due to its ethical concerns and potential consequences, the team deliberately avoids this state.

Retto's development focuses on mending his relationship with Kirara, confronting the ongoing alien threat, and navigating HxEros team dynamics. His story concludes with the Censor Bug queen and princess abandoning their mission after being persuaded by the team. Retto continues protecting Earth alongside Kirara and others from rogue alien threats while solidifying his romantic relationship with her.