Need some quick translating
 

I'm obsessed with the first song that plays in this video:

[Mint]+decaf tour' - YouTube

I would be forever grateful if someone could figure out what is the artist name and, if possible, what that first instrumental is called.

Any help at all would be appreciated!

This band is called [Mint].

The first instrumental is ’情熱大陸'(Jounetsu-tairiku/Jonetsu-tairiku) by 葉加瀬太郎(Taro Hakase), I think.