- Japanese (Native)
- English (Second-language / CEFR B1)
- Mathematics Grade 3 certificated by Japanese foundation (The Mathematics Certification Institute of Japan). (2020)
- π Lemon's Resting Area (Administrator)
- πΏ Ivy Cafeteria / GitHub
- π Alice Project / GitHub
- βοΈ KDE Community (User)
- π Japan KDE User Group (Member)
- Misskey.io: @lemon73
(Fediverse - You can contact me via ActivityPub such as Mastodon, Misskey and others) - Matrix: @lemon73
- GitHub: @Lemon73-Computing (here)
- GitLab: @lemon73
- KDE Invent: @futurelemon
- Lemon's Resting Area website (Japanese)
- Lemon73 Blog (Japanese)
- LEC website (Japanese)
- Alice Novel (Japanese)