Caico - 同人誌即売会の買い物リスト&マップ is a tools app by DDWorks.info with 5,000+ downloads (about 6.4K estimated). +16 installs in the last 7 days. Install growth, rank history, SDKs and ad networks.
From the store listing: “Use maps and lists to check out circles at doujinshi conventions and plan your shopping for the day. You can share and divide the tasks among groups.”