Original Song by the Band Iced Blade. Iced Blade is the band that created the original pieces in Sunrider. Here is a link to their Kickstarter where you can find more information about them if you like their work and another link to their YouTube channel and Twitter. Go and support them please.
https://www.kickstarter.com/projects/1500482054/iced-blade-tokyo-j-pop-metal-sora-no-senritsu-game
https://www.youtube.com/user/IcedBladejp/videos
https://twitter.com/IcedBlade_jp
I do not own any of this content. Sunrider is a visual-novel/video-game and has a beautiful and legendary soundtrack that should be shared. If you haven't played this game please try it and if you like it give it some needed support.
Here you can download it and play it on steam.
http://store.steampowered.com/app/313730/
Here you can download it and play it on IndieDB
http://www.indiedb.com/games/sunrider
Here you can find their kickstarter page.
https://www.kickstarter.com/projects/1500482054/sunrider
Here you can find the official Sunrider website.
http://sunrider-vn.com/