Illustration

https://www.irasutoya.com/

IBM Plex Sans

https://github.com/IBM/plex

SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007

Moya

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MIT License / Copyright (c) 2014-present Artsy, Ash Furrow

SkeletonView

https://github.com/Juanpe/SkeletonView

MIT License / Copyright (c) 2017 Juanpe Catalán

Hiragana Katakana Stroke Order Animation

https://github.com/parsimonhi/animCJK

Arphic Public License