"[Smartphone Edition] Arcane Investigator Serepias: The Elixir of Corruption — 'Sexual Desire' Sealing Chronicles" is an adult RPG for smartphones created and sold by the circle "Ichihaya Yuzuha." With 118 copies sold to date, this title carries multiple genre tags including female protagonist, married woman, pleasure corruption, netorare (cuckolding), fantasy, trance/suggestion, shame/humiliation, and large/huge breasts.

The protagonist is Serepias, a married woman who works as an "Arcane Investigator" specializing in the study of unknown creatures and ancient ruins. One day, she accepts a commission connected to her missing husband. As her investigation deepens, she discovers a string of abnormal incidents occurring throughout the city. As humans who have lost their sanity and transformed into monsters appear one after another, the existence of a "forbidden drug" that erodes her body from within gradually comes to light. The conflict with a mysterious faction and the physical transformation caused by the drug form the backbone of the narrative, with Serepias's pursuit of the truth intertwining with erotic developments at every turn.

The creator positions the game's genre as a "classic erotic RPG," featuring a scenario set against a fantasy world that centers on pleasure corruption and trance/suggestion elements. The combination of a married protagonist with netorare, shame, and humiliation tags suggests a deliberate design philosophy focused on carefully depicting a gradual process of corruption. The game is optimized for smartphones, with controls built around touch-based interaction.

In terms of character design, as the large/huge breasts tags indicate, protagonist Serepias features a voluptuous physique with emphasized proportions. Based on published rough sketches and event information, multiple mischief events under various circumstances have been prepared. As Serepias encounters different characters and entities throughout her investigation, various sexual situations are woven into the progression.

The sales figure of 118 copies, considering the time elapsed since its release on February 26, 2026, demonstrates steady demand for a smartphone-exclusive adult doujin RPG. The circle "Ichihaya Yuzuha" has shown thorough promotional preparation, including producing a PV trailer to preview the game's content in advance. The structure, which layers multiple adult genre elements within a fantasy RPG framework, reflects a design conscious of appealing to fans across each of those niches. This is a noteworthy title for those interested in the theme of a married protagonist's descent into corruption, as well as those seeking an adult RPG playable on smartphones.