The game is split into two phases. During the daytime, you scavenge for parts, rearrange the bedroom layout, and craft new gear. During the nighttime, you survive the onslaught.

"Night Attack on Little Sis" is a game that combines elements of strategy, action, and role-playing games (RPGs) with adult content. The plot revolves around a protagonist who finds himself in a situation where he must navigate a world filled with challenges and adversaries, all while dealing with the complexities of his relationships, particularly with his "little sis." The game is known for its deep storyline, which explores themes of power, control, and the consequences of one's actions.

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