Let's Kouken!!! Indeed.
Chou-kouken Suishin Gakkyoku-shuu by Adachi Kenmei and Kouken Girls

Yes. So, I tried searching for this FREEDOM WARS promo-OST only sold in Comiket #86, but it was impossible to find... not anymore. Not my rip.

Tracks

01. Let's Kouken! ~Koi no Choueki wa 1,000,000 Nen~
02. Panopticon Roudouka Dai'ichi
03. Na Na Na Na
04. Ibaralullaby
05-08. instrumentals

https://mega.co.nz/#!3FARnRZR!AxVhOd6OphcQFddblqpoLrDinK1NQSyYVzc_sqJ 0HRc

Thank you for the contribution Lefance!

This will make my 3.5 hour drive back home tomorrow a lot better