記憶のギフト ~未来の自分へ~ is a lifestyle app by Fantamstick, Ltd. with 1+ downloads (about 1 estimated). Install growth, rank history, SDKs and ad networks.
From the store listing: “Simply record one item of food, clothing, or photo. The next day, a "recall quiz" will be presented based on that record. Hide your shopping list and try to remember what you bought. Your ability to recall improves with practice.”