Only the current version so far — new entries appear as the app ships updates.
文通日記 - AIとの交換日記 is a lifestyle app by UCARON with 10+ downloads (about 16 estimated). +1 installs in the last 7 days. Released Sep 26, 2026. Install growth, rank history, SDKs and ad networks.
From the store listing: “I write in my diary and send letters to my AI pen pal. A reply arrives in 1-3 days, affixed with a seasonal stamp.”
