Plenty of Japanese "grown @$$ [men]" (and women) enjoy anime...It's just a medium for telling a story, nothing to be ashamed of if you enjoy it lol. I get the stigma though, the shame is naysayers can't see it for what it is
Ok, enough of my social commentary....here's a couple I'll toss in
Chatmonchy - Just Between Us (Kuragehime OP)
Houkago Tea Time - Don't Say Lazy (K-On! Season 1 ED)
Not the most complicated bassline, but sounds cool and the song is great.
Don't forget the epic playlist in K-On.
"My love is like a stapler" has to be the best title ever.

