Full Fathom 500

Full Fathom 500 opens with an unsettling premise: two women wake on their first anniversary to find themselves imprisoned a thousand metres beneath the sea. Developer 23noko crafts this scenario as a kinetic visual novel—no choices to make, only the slow unraveling of a relationship under impossible circumstances. The framing device of a diary entry gives the narrative an intimate, confessional quality, as if you're reading something meant to stay private.

The game is short, roughly 30 to 60 minutes across approximately 13,000 words, but it uses that brevity deliberately. 23noko's writing emphasizes atmosphere over exposition: the ocean outside remains deliberately obscured and suggestive rather than fully revealed. What emerges instead is a character study of two women confronting each other in a confined space, their dynamic complicated by existing tensions that the catastrophe only amplifies. The relationship explores adult themes including intimate scenes and explicit content, but the focus remains on emotional volatility rather than eroticism.

The 'toxic yuri' tag (this was made for the 2026 Toxic Yuri VN Jam) signals that this isn't a comfortable love story. Expect psychological friction, power imbalances, and the kind of destructive tendencies that emerge when affection tangles with dependency or resentment. The game's visual presentation relies on hand-drawn sprites and CGs from artist chao, with a deliberately limited colour palette that reinforces the claustrophobic, submerged setting.

Technically, Full Fathom 500 runs on Windows, macOS, and Linux. The game's minimalist interactivity—you read rather than choose—makes it accessible but also means investment hinges entirely on whether 23noko's voice and the scenario's dread pull you in. It's a work aware of its own amateur origins (the developer notes this is their first writing in some time), but that self-awareness is part of its appeal.