Since June 2015, iPhone supports Apple Books Author format in Apple Books.
Due to this change, E-SAKUGA became available on iPhone. Various features including Tapmation™ are 100% intact. However, due to Apple’s specifications, how Apple Books Author books appear/work on iPhone is different from iPad.
Each action is performed in a separate window for iPhone, so E-SAKUGA’s seamless operation between checking the key frames, time sheets, and reference videos simultaneously cannot be done in iPhone. Please have this in mind if you intend to view E-SAKUGA with your iPhone.
Added on October 2016:
Since iOS10, Tapmation™ works as intended also on iPhone.
Tapmation™ does not open a new window anymore and works seamlessly like on an iPad.
However, still images will prompt a new window like before. We cannot view all elements on one screen seamlessly like on an iPad.