The Best Ecchi Romance Anime of All Time

High School DxD is a popular ecchi romance anime that follows the story of Issei Hyoudou, a perverted high school student who dreams of having his own harem. After being killed on his first date by a fallen angel, he is resurrected as a devil and serves Rias Gremory, a beautiful devil and the president of his school's Occult Research Club. The series explores Issei's growth as a demon, his relationships with his fellow club members, and his quest to become the Harem King.

The Testament of Sister New Devil revolves around Basara Toujou, a high school student whose father remarries, bringing two beautiful step-sisters into his life – Mio and Maria. However, these sisters are actually a demon lord's daughter and her succubus servant. As Basara's life becomes entwined with theirs, he must protect them from various enemies while managing the growing romantic feelings between them.

Sekirei is set in a world where super-powered beings called Sekirei are forced to fight in a deadly tournament called the Sekirei Plan. Minato Sahashi, a struggling college student, finds himself caught in the middle of this conflict when he meets Musubi, a Sekirei who chooses him as her Ashikabi (master). As Minato gathers more Sekirei under his command, romantic tensions and rivalries arise.

Demon King Daimao tells the story of Akuto Sai, a young man who enrolls in a magic academy, only to be prophesized as the future Demon King. As he struggles to defy his fate, he forms alliances and relationships with various female students, all while dealing with the consequences of his newfound power.

To Love-Ru tells the story of Rito Yuuki, a high school student who accidentally encounters Lala Satalin Deviluke, an alien princess on the run from her arranged marriage. As Lala decides to stay on Earth and attend Rito's school, they develop romantic feelings for each other while dealing with numerous alien threats and love rivals.

Kissxsis revolves around Keita Suminoe, a high school student with twin step-sisters, Ako and Riko, who harbor romantic feelings for him. As they compete for Keita's affection, their relationships become increasingly complicated and risqué, leading to humorous situations and misunderstandings.