An alien named Lily has become so addicted to yuri, the genre of intimate relationships between women, that ordinary stories no longer provide enough stimulation. To satisfy her craving for a more profound experience, she decides to interfere directly with human lives and engineer what she considers real yuri. Lily sets her sights on a pair of childhood friends, Iori and Luna, who have difficulty being honest with each other about their feelings. Believing they are the perfect subjects, she devises various schemes and begins her Project Yuriforming to push them into a romantic relationship.

The story unfolds as a four-panel gag manga that blends humor and emotion, published in Houbunsha's Manga Time Kirara MAX magazine. The school setting serves as the primary stage for Lily's often over-the-top and comedic attempts to manufacture yuri scenarios. While the premise is driven by Lily's alien intervention, the narrative also explores the genuine, if clumsy, emotions of the human characters caught in her plans.

A significant development occurs when another alien named Matsuba arrives on Earth with the mission of bringing Lily back. However, his objective becomes complicated when he encounters Iori's mother and finds himself swayed by her charm, introducing a new and unexpected dimension to the story's exploration of relationships. As the series progresses, Lily continues her self-appointed mission, leading to unpredictable and humorous situations that keep readers engaged with the characters' evolving dynamics.