The game is structured over four days. Each day unlocks new levels of interaction and scenes. Day 1-2: Focuses on subtle, stealth-based interactions.
You do not need a lost Flash game or a Japanese BBS account. The creators of the concept (whoever they were) may have intended this as a rather than a product. Hizashi No Naka No Riaru Uncenso
Many players are impressed by how much expression the developers squeezed out of a simple 2D engine. The game is structured over four days