sorry for the delay, RL issues. Both VS Arashi and Himitsu no Arashi chan have a higher quality version: after pressing the button play and making the video start, open the menu with the blue H (pressing the orange arrow), and check the one with the higher number, which corresponds to a higher video quality. VSA should have 480, HnA has 720.Set that and the let the video load as usual. Unfortunately I don't know how to post the video in that setting already ( I don't even know if it is possible), if you have any questions or doubts feel free to ask. Enjoy!
Credits to
xuanluxuan Vs Arashi
Himitsu no Arashi chan
Arashi ni Shiyagare
links to original pages
VS Arashi Himitsu no Arashi chan Arashi ni Shiyagare