NejicomiSimulator Vol.5 is an adult-themed masturbation simulator developed by Yabukara-do (やぶから堂) Live2D animation

, not 2021. The earlier 2021 dates in the series refer to Vol.1 and Vol.2. Official Availability

While the user query highlights 2021, the series has seen significant updates and new volumes since then: NejicomiSimulator TMA01 on Steam

: As a PC simulation, it typically requires a Windows OS and is available for single-player use with features like Steam Cloud and achievements. Official Versions and DLC

The game is frequently updated on official storefronts to improve quality-of-life features. : Available on Unlock All Settings Pack

Real-Time Interaction

: The character reacts dynamically to mouse operations with synchronized animations, breathing, and sound effects.