Research Diary is an adult transformation visual novel where a lonely man joins a once-in-a-million clinical trial. Track changes, date unexpected partners, and unlock 20+ explicit scenes and animations. An experimental 18+ journey of body and mind.
Story & Strange Premise
1. Your world has shrunk to the size of a studio apartment. Days blur past with no messages, no plans, no one checking in. The loneliness is a physical weight pressing down on your chest every morning. Then the call comes. A voice on the other end mentions a clinical trial, an experimental enhancement procedure designed to address male insecurity at its most fundamental level. The offer is once in a million, and the compensation is almost too good to be true. Desperation makes the decision for you.
2. The game opens with your character signing consent forms in a sterile white room, having no idea what he's actually agreeing to. Research Diary follows your journey through a multi-week treatment program where the injections start working almost immediately, and not always in the ways the doctors predicted. The plot thickens when other test subjects enter the picture, each reacting to the serum differently, each carrying their own baggage and desires. What begins as a medical trial spirals into something far more intimate, complicated, and strange.
3. The narrative unfolds entirely through first-person diary entries, text messages, and date sequences. You record every change in a dedicated in-game journal, tracking physical transformations alongside emotional developments. The writing balances clinical observation with raw, vulnerable introspection, capturing the weirdness of watching your own body become unfamiliar. Romance options emerge naturally through the testing schedule, with fellow participants, nurses, and even mysterious figures who seem to know more about the experiment than they should.
Gameplay & Transformation Tracking
1. Research Diary operates on a calendar system where each day brings new measurements, side effects, and social opportunities. Your choices during conversations determine how other characters perceive your transformation, whether with curiosity, jealousy, or desire. The game features a detailed Progress Log that visually charts your development across multiple physical attributes, complete with before-and-after comparison images that unlock as you advance through the trial weeks.
2. The daily routine includes optional side activities that affect your results. Following the treatment plan strictly yields consistent growth but limits social encounters, while skipping measurements to spend time with other subjects unlocks romance routes at the cost of slower visible changes. A hidden Compatibility Score tracks how well your body accepts the serum, influenced by minor decisions like whether you eat breakfast before appointments or exercise in your spare time. Meeting certain thresholds unlocks alternate transformation paths and unique scene variations.
3. Replayability comes from the branching trial outcomes based on your participation style. Completing the full program reveals one ending, while dropping out midway leads to dramatically different conclusions. The game supports multiple save slots and a New Game Plus mode that carries over your transformation journal, allowing you to target specific romance routes without replaying the entire diary. Gallery unlocks include alternate scene angles, character backstory entries, and developer commentary on the medical inspiration behind the treatment.
Adult Features & Gallery Collection
1. The 18+ content in Research Diary focuses on the awkward, thrilling, and sometimes terrifying experience of rapid bodily change. Intimate scenes trigger during check-up appointments, accidental encounters in shared housing, and late-night conversations that turn into something more. Each romantic partner reacts differently to your transformation, with some drawn to your growing confidence and others specifically fascinated by the physical results of the trial. All mature scenes are fully voiced in English and Japanese.
2. The game features a dedicated gallery containing over twenty unique illustrations and fully animated sequences, each unlocked by reaching specific milestones in your transformation diary. Scene categories include medical examinations, private moments alone with your journal, and increasingly bold encounters with the five romanceable characters. A special Comparison Mode lets you view before-and-after versions of each scene side by side, highlighting every change the treatment has caused throughout your journey.
3. All adult material can be toggled via an in-game settings panel for players who prefer to focus on the transformation narrative rather than the explicit content. Content warnings appear before particularly intense scenes, with skip options that preserve story flow. The Censorship Patch is pre-integrated into the western release, requiring no additional downloads or configuration. A replay gallery unlocks automatically after completing any ending, allowing you to revisit your favorite moments and discover variants you missed during your first playthrough.
