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Calil is Japan's largest library book search engine and catalog aggregator designed to track real-time book availability and rental statuses across public and academic libraries nationwide.

NDL Search (National Diet Library Search) is the official central catalog and digital search portal operated by the National Diet Library of Japan that consolidates bibliographic records across national, public, and academic libraries.

CiNii Research is an official Japanese academic search engine and scholarly navigator operated by the National Institute of Informatics (NII) that centralizes access to research papers, books, doctoral dissertations, and research data.

Japan Search is an official Japanese national digital archive aggregator and search platform operated by the National Diet Library that centralizes access to millions of cultural, historical, and scientific data assets.

au Web Portal Search is an official Japanese web search engine and digital navigation gateway operated by KDDI and mediba that serves as a mobile search platform for au telecom subscribers.