It's My Life - Vol. 4 Ch. 25.4 - Omake

[MangaDex]

 

[En_Ma]

In the fist page Astra is dressed like Joakim Brodén from Sabaton https://en.wikipedia.org/wiki/Joakim_Brodén
Noah's shirt is likely from the Loud park festival, in Chiba. https://en.wikipedia.org/wiki/Loud_Park_Festival . During the 2015 edition, Sabaton played there.

 

[RedVanGhoul]

Into the motherland!
The german army marched!

 

[ananymouss]

>yaboyoh's past
>reading the author's other manga, Killing Me/Killing You

*cry a lot*