Since 2017, Japan has rapidly developed its hard and soft infrastructure to accelerate the use of alternative dispute resolution (ADR) in Japan, such as establishing the Japan International Dispute Resolution Center and the Japan International Mediation Center, Kyoto, as well as amending the Foreign Lawyers Act. The legislative process to amend the Japanese Arbitration Act is underway and discussions to accede to the Singapore Convention are ongoing. Mediation and settlement discussions involving judges during the litigation process are traditionally common in Japanese court practices, which would have some implications for investor–state mediation, which is a recent hot topic in the field of investor–state dispute settlement. Numerous means of further improving the efficiency and effectiveness of ADR proceedings have been discussed globally, including mid-stream conferences, Calderbank offers, the use of mediation in complex disputes, and the advanced use of Arb-Med-Arb proceedings utilizing party-appointed arbitrators.