[Akatsuki Advent Calendar 2016](https://qiita.com/advent-calendar/2016/aktsk) [Akatsuki Advent Calendar 2017](https://qiita.com/advent-calendar/2017/aktsk) [Akatsuki Advent Calendar 2018](https://adventar.org/calendars/2990) [Akatsuki Advent Calendar 2019](https://adventar.org/calendars/3952) [Akat…