四十秒のオリ図鑑

四十秒のオリ図鑑 is a free collection RPG for the browser, in Japanese, and a spin-off of the developer's time-loop novel 四十秒の交差点. In the same town, the repeated Monday has left behind “ori” (澱, sediment of time): small spirits made from everyday leftovers such as an alarm clock that failed to ring, a sold-out sign or a forgotten umbrella. You can only fight while the crossing light is green: if a battle is not settled in 40 seconds, which is four turns, the ori dissolves and is gone. You copy ori onto ema (votive plaques) to catch them and fill the index; which species appear depends on the place and time of day, some only on rainy loops or on real-world Mondays, and rare shining ones exist. Each ori learns its own moves by level and can use four at a time, and types follow a cycle (morning beats noon, noon beats evening, evening beats night, night beats morning). The signature mechanic, “rewind 10 seconds”, undoes the last turn, whether a failed catch or a hit you took; how often an ori can rewind is innate, and clock-themed ori rewind more. Catching the same species again stacks it and, at the cap, awakens it so its finisher can be used twice per battle. You explore the shrine, school, shopping street, riverside and hills, take a bus to the next town as the index progresses, and face “masters” at night, which are the game's boss fights. You decide when time moves on; a day's end fully heals your team, and losing costs no ori or levels. The story is told in the original's novel style with Asuka and a childhood friend, Chinatsu. Once the master of the home town is calmed, a fixed-order gauntlet, “40-second rush”, opens at the shrine. The developer describes it as squeezing the collection RPGs of the Game Boy Color era into one vertical phone screen. Per the developer, kawaiy, the code is almost all written by Claude Code, and the illustrations on the site are generated with ChatGPT and the music with Suno. Plain HTML, CSS and JavaScript with no framework. Free in desktop and phone browsers.