The narrative begins with the protagonist, a young man who has recently transferred to a new school and is living with an old family friend, Karen, and her two daughters. He is an ordinary, inexperienced individual until he inadvertently signs a mystical contract, thereby summoning the succubus princess, Anath. This event awakens his latent nature as a "Guardian." Anath explains that she was imprisoned by her sister Madhava and escaped through the contract. Her goal is to regain her power, which requires the protagonist to engage in sexual experiences. His primary objective becomes to increase his sexual prowess and stamina to provide Anath with the magical energy she needs to restore her power. The plot unfolds across daily life activities, including school, part-time jobs, and social interactions, intertwined with Anath's guidance and magical manipulation. The protagonist builds relationships with several female characters, including Karen, Jane, Natalie, Serena, and others, which leads to numerous sexual encounters. A major conflict arises when a mysterious force begins to corrupt people, turning them into aggressive, possessed versions of themselves, linked to the Vallis Silentia parasite. The Halloween party, a memorial for a deceased student named Clara, is canceled, triggering a chain of events where students, including Dana, Elena, and Daisy, are taken over by the parasite. The protagonist must traverse the supernatural realm of Asphodel to rescue them. The climax of this arc involves the protagonist using his sexual energy, empowered by Anath's magic, to cleanse the corrupted girls from the parasite. He faces Dana in her most corrupted form, resulting in a violent, transformative encounter. The conflict is resolved with the help of his friends and allies, including the witch Serena and the ghost Clara, though many secrets remain, and the threat of the "Mother" parasite lingers.

A relationship built on a deep, nostalgic bond. The emotional conflict centers on the age gap and the taboo of their feelings, which blurs the lines between motherly love and romantic desire. Her path explores themes of loneliness, healing, and the rekindling of a lost connection.

A path of gentle, first-love discovery. Her route is defined by her shy, kind nature and the conflict between her timid personality and her growing, intense feelings for the protagonist. It is characterized by intimate, tender moments and a slow progression from friendship to a deep, committed relationship.

A path of intense power dynamics and sexual exploration. The route explores a relationship of dominance and submission, where both characters switch between the roles of dominant and submissive. Her path is defined by emotional turmoil, a desire for control, and a complex internal conflict that masks her true desires.

A path centered on seduction, manipulation, and high-stakes drama. Dana is a powerful and enigmatic figure whose route is full of blackmail, sexual tension, and a deep, twisted bond. Her story is heavily involved with the main supernatural plot, as she becomes a primary vessel for the Vallis Silentia.

A path grounded in trust, the supernatural, and a shared sense of purpose. Serena is the witch who acts as a guide and ally. Her route explores the protagonist's introduction to the supernatural world and a deep, intellectual and emotional bond based on mutual understanding and respect.

A path focused on innocence, bad luck, and the revelation of hidden truths. Elena is a carefree, accident-prone girl who is secretly a host to the Puka, a luck spirit. The route involves helping her break free from her curse and growing closer to the gentle, kind soul within.

A path of gentle discovery and acceptance. Lily is Dana's shy, kind sister who is a futa (a girl with both female and male genitalia). The route involves her struggle with self-acceptance and the protagonist's unconditional support, leading to a loving and tender relationship.