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Marshmallow Imouto Succubus header art

Marshmallow Imouto Succubus

Tsukikawa Keisuke had a strange dream. That dream involved his younger sister but instead of her usual, innocent self, she had lust in her eyes. So he finds out that a succubus lurks within her! How will he choose between his innocent sister and the allure of a lustful succubus?!

Steam Page
Developer
Orcsoft
Publisher
Sekai Project
Release
September 22, 2023
2 years and 315 days ago
Steam Reviews
Positive22 reviews81.8%

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Updated: Jul 13, 2026Developer scaleThe operating scale of the game's developer.
Updated: Jul 13, 2026Publisher scaleThe operating scale of the game's publisher.
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Search Google: Is Marshmallow Imouto Succubus self-published or published by Sekai Project?Publisher statusHow the game's publishing relationship is classified.
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Media

6 items

About the Game

STORY


Tsukikawa Keisuke had a strange dream. That dream involved his innocent younger sister, Saki. Saki was a naïve girl who even believed that babies were made from just kissing. However in his dream, Saki’s innocence was replaced by eyes filled with lust as she creeps into Keisuke’s bed. The next day, Saki was her same innocent self to Keisuke’s relief. He was relieved that it was a merely a dream.

However, he soon learns from his father that a succubus lurks within his little sister. Having to choose between his dear, innocent little sister and the allure of a lustful succubus, what will Keisuke do?

FEATURES

  • Visual novel with 2 possible endings
  • Japanese voice acting (Except protagonist)
  • Voiced line playback
  • History/backlog function
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