"Triangle Blue" is an adult anime series that delves into mature themes and explicit content. Episode 1 introduces viewers to a complex narrative centered around a love triangle involving the protagonist, his girlfriend, and a close friend. The story begins by establishing the deep bonds and emotional connections between the characters, setting the stage for the ensuing tension and conflict. As the episode progresses, the protagonist finds himself grappling with feelings of desire and guilt, leading to a series of provocative and morally ambiguous situations. The animation is detailed, capturing the nuanced expressions and intimate moments that define the series. Themes of love, betrayal, and the complexities of human relationships are prevalent, contributing to the series' thought-provoking atmosphere. The pacing allows for character development while maintaining the tension and suspense that keep audiences engaged. Overall, Episode 1 offers a compelling introduction to a narrative that appeals to viewers who appreciate adult stories with psychological depth and complexity.