Japan 20 Days Itinerary - from Argentina

Hi guys,
We are Mariana and Diego, rushing to finish our itinerary for our upcoming trip to Japan on March-14.
Could you take a look to our itinerary and help us decide wether to go for a 14-days pass or 21-days one?
Also, if you have any comment or suggestions regarding the itinerary itself it will be very much appreciated.

Thanks!

Diego

Day 01 - Mo Mar-17: Arrival to Narita, 9:25AM > Minato, Tokyo (Hotel)
Day 02 - Tu Mar-18: Asakusa/Shibuya/Shinjuku (Tokyo)
Day 03 - We Mar-19: Ueno (Tokyo)
Day 04 - Th Mar-20: Akihabara (Tokyo)
Day 05 - Fr Mar-21: Tokyo > Kamakura & Yokohama > Tokyo
Day 06 - Sa Mar-22: Tokyo > Nikko > Tokyo
Day 07 - Su Mar-23: Harajuku/Yoyogi/Meiji (Tokyo)
Day 08 - Mo Mar-24: Tokyo > Takayama
Day 09 - Tu Mar-25: Takayama > Shirakawago > Takayama > Kyoto
Day 10 - We Mar-26: Kyoto > Koya-san
Day 11 - Th Mar-27: Koyas-an > Osaka > Kyoto
Day 12 - Fr Mar-28: Kyoto > Hiroshima > Miyajima
Day 13 - Sa 29-Mar: Miyajima
Day 14 - Do 30-Mar: Miyajima > Okayama > Kyoto
Day 15 - Mo 31-Mar: Kyoto > Kanazawa > Kyoto
Day 16 - Ma 01-Abr: Kioto (west)
Day 17 - Mi 02-Abr: Kyoto > Mount Fuji > Kyoto
Day 18 - Ju 03-Abr: Kyoto (east)
Day 19 - Vi 04-Abr: Kyoto (center) > Tokyo
Day 20 - Sa 05-Abr: Tokyo
Day 21 - Do 06-Abr: Flight back to Buenos Aires, 10:30AM