17 (2023) 3 , pp.219–229 ⋆ Kenji Saito, Kayo Kobayashi, Waki Takekoshi, Atsuki Hashimoto, Nobukazu Hirai, Akifumi Kimura, Asuka Takahashi, Naoki Yoshioka, and Asuto Mano, “Double Impact: Children’s Serious RPG Generation/Play with a Large Language Model for Their Deeper Engagement in Social Issues”, Serious Games – 9th Joint International Conference, JCSG 2023, Lecture Notes in Computer Science 14309, 2023, pp.274–289 Kenji Saito, Yutaka Soejima, Toshihiko Sugiura, Yukinobu Kitamura, Mitsuru Iwamura, “Is Ethereum Proof of Stake Sustainable? — Considering from the Perspective of Competition Among Smart Contract Platforms —”, arXiv:2309.11394, Sep. 2023 ⋆ Kenji Saito, “A Path to Meta-Nature : Automated Environment Where Even Pencils Grow on A Tree”, CCRC Conference 2022 – Towards a Cyber Civilization Risks and Opportunities, February 2022 Kenji Saito, Satoki Watanabe, “Lightweight selective disclosure for verifiable documents on blockchain”, ICT Express, Volume 7, Issue 3, September 2021, pp.290-294 2024 2 — 2024-04 – p.4/9