Itinerary help ~15 day trip

My family is planning a ~15 day trip to Japan. We have made this rough draft itinerary. This is our first time visiting Japan and we are really excited. We would like any type of suggestions,tips or helpful insight. I appreciate you all and thank you for taking the time to look this over!

TOKYO: 3 days 

3D Cat- Shinjuku,    Meijijingo, Godzilla  
Senso Ji Temple   
Nakamise Dori 
Shibuya Sky   
Team Lab         
Pokemon Center/ Nintendo Center   
Meiji Shrine  
Shibuya/ Shibuya Crossing  
Hachiko Status  
Don Quitote  
Gotokuji Temple
DisneySea

MT FUJI ( 1 day)

KYOTO ( 1 day)

Bamboo Forest (arrive early)  
Arashiyama Monkey Park  
Kyoto Tower  
Fushimi Inari Tori Gates  
Nishiki Market  
Gion District  
Maccha House  

Nara ( 1 day)

OSAKA ( 3 days )

Osaka Caste  
Shinsekai Market  
Namba Taska Shrine  
Umeda Sky Building Observed Deck  
Giant Ferris Wheel  
Dotonbori – Glico Man  
Shinsekai Market  
Universal Studios

Hiroshima ( 1 day)

Atomic Bomb memorial
Peace Memorial Park  
Hiroshima Castle  

(Maybe Miyajima/ take ferry)  

SOUTH KOREA ( 4 days)

Gyeongbokgung Palace  
Seoul Tower  
Hanok Village  
Insadong( Shop)  
Myeongdong (Shop)  
Changdeokgung Palace  
Rainbow Bridge  
Namsan Tower (Cable Car)  
CAFE Pokpo (waterfall)