Satori's overworked herself into bed, but Okuu needs help remembering things! You can't use her heart-reading power, and will instead have to ask questions and use her power of recollection to correct wrong info, all while enduring visits from Orin and Koishi as you deduce what Okuu's forgotten!
The game casts you in the role of Satori, a workaholic mind-reader who has fallen ill. Your assistant, Okuu, comes to you for help remembering various forgotten objects or concepts. With your power weakened, you must rely on a "power of recollection" to deduce what Okuu has forgotten.
To uncover the forgotten item, you pose yes/no questions to Okuu. However, her bird-brained nature means she often provides incorrect answers, leading you astray. When this happens, you can use Satori's third eye ability to confirm the true information, helping you narrow down the answer.
Adding to the challenge, the mischievous Orin and Koishi will occasionally interrupt, trying to make Okuu forget more information. You must deftly handle these interruptions while continuing your line of questioning.
As you progress, the topics Okuu forgets become more obscure. Fortunately, the game provides a helpful feature - after failing a stage multiple times, it reveals a list of all possible answers, allowing you to better deduce the correct solution.
Reviewers praise the game's unique and creative premise, as well as its cute artwork and music. They find the guessing gameplay loop engaging, though some note it can be quite challenging, especially when dealing with Okuu's unreliable answers.
While the game is relatively short, with only 6 main stages, reviewers highlight its replayability, especially the bonus "extra" stage that tests players' knowledge of the broader Touhou universe. Some also suggest the game is best experienced with friends, as the collective guessing effort can be more rewarding.