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UNDERGROUND PARTY

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    Synopsis

    ■Story

    Shiori, the main character, was suddenly abducted and brought to the underground world.

    She was dressed into a bizarre bondage outfit,

    and strange piercings were attached to her nipples and clitoris.

    Shiori was confused and couldn’t comprehend the situation she was brought into,

    now she tries to escape in the outer world while being indecently exposed…

    ■Game contents

    Horizontal sidescrolling 2D game.

    Emphasis is placed on operability, and there are some action elements.

    Main character can use ranged and melee attacks.

    Jump over obstacles and dash to gain momentum,

    there is some vertical scrolling by using the ladders and platforms.

    Also main character can masturbate to refill her HP gauge.

    Each orgasm unleashes the full screen attack.

    ■Erotic elements anc collection features

    Main character collects some items during the levels,

    those items unlock special CGI scenes (35 in total).

    There are some alternative features during these scenes:

    images, light flash, voice playback.

    Also there are another items to collect,

    they unlock the “classified information” sheets.

    There are some lore and data info pieces.

    There are numerous captured sl*ve girls being restrained in the background,

    it adds some tension while escaping.

    There are no “erotic defeat” scenes during the gameplay to keep the fast pacing.

    ■Real voice acting

    Yukiko Shinomori is the voice actor.

    She’s in charge of all the voices including main characters and enemies.

    There are lots of different sounds,

    such as voice clips, screams, gagged muffling etc.

    *Voice is Japanese only.

    ■Anti-frustration features

    There are invisible checkpoints in the game.

    You can also choose level which was previously cleared to start from there.

    If player is stuck, there are 2 ultimate options to help them.

    “Clear the level” and “Defeat the boss”:

    Select those options to have an instant win.

    This is aimed to support players who want to see the plot but are unable to pass through some difficulties.

    ■Post-game mode

    After finishing the main scenario, player can test their skills by beating the extra levels.

    In addition to the levels, extra boss fights are also made to be harder.

    After clearing the extra part, the gallery would be fully opened.

    Of course, there are alternative ways to open it which are described above.

    ■Configurations

    Player can always change the keyboard settings,

    gamepad is also supported.

    (Stick is not supported because it’s impossible to change the cross-keys settings).

    Volume, BGM and sound effects are tuned separately.

    ■Original author-made BGM

    All BGM tracks are brand new.

    BGM is implied to match the level aesthetics.

    (Later the soundtrack will be released and sold as a separate creative pack).

    (English product description provided by the creator.)

    CircleSoYundSalT
    TagsR18, Action, Voice, Music, Application, English
    Price1,760JPY

    Editorial Review

    ★4.7 / 5 — henhenta editorial rating (our own assessment, not the DLsite official user score)

    Underground Party carves out genuinely uncommon territory in the adult game space: a horizontally scrolling action platformer where mechanical depth and erotic content operate as genuine partners rather than window dressing. Most adult games in this vein treat action as either negligible filler or novelty packaging around static scenes. Here, the developers have invested real architecture into movement—dash momentum, ladder traversal, jump timing—making the action loop functionally satisfying independent of its context.

    The core conceit justifies this mechanical focus brilliantly. Shiori’s exposed state during escape creates natural tension between vulnerability and agency; she’s both constrained by her situation and empowered through combat and collection. The mechanic of using masturbation to refill the HP gauge is more than shock value—it’s a rhythmic gameplay loop that ties recovery directly to the erotic premise. Full-screen orgasm attacks add tactical weight to these moments, preventing the system from feeling purely exploratory.

    The production quality signals serious craft. Voice work, a dedicated music layer, and 35 CG sequences with toggle-able variants (image, flash, audio) indicate production resources typically reserved for higher-budget visual novels. The application format suggests careful optimization for performance alongside visual fidelity.

    Target audience: Players seeking mechanical substance alongside adult content—those fatigued by static visual novels or perfunctory adult game action, willing to invest in actual platformer skill while engaging with explicit material.

    UNDERGROUND PARTY succeeds because it doesn’t treat gameplay and eroticism as separate contracts with the player. The result is a work that demands recognition as a legitimate action title that happens to contain adult content, rather than adult content wearing action game clothing. Rare and worth the attention of anyone serious about this intersection.

    Related Tags:

    R18  |  English  |  Application  |  Music  |  Action

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