From the point of view of a stranger (meaning that I have not seen the source material), this must have been an bonus CD of music, probably the voice actors singing their favorite anime songs or corresponding their characters's favorite anime or personalities (wild guess). I don't know if there ever was a karaoke episode or parts where they went to some part where the theme was just playing in the background. But from a meta point of view, Bakuman's manga was published in Weekly's Shonen Jump, a magazine that also published Dragon Ball, Yu Yu Hakusho, To Love-Ru, Rurouni Kenshin (Samurai X) and of course, Captain Tsubasa to name a few.
What's the relation between Bakuman and moete hero from Captain tsubasa?
From the point of view of a stranger (meaning that I have not seen the source material), this must have been an bonus CD of music, probably the voice actors singing their favorite anime songs or corresponding their characters's favorite anime or personalities (wild guess). I don't know if there ever was a karaoke episode or parts where they went to some part where the theme was just playing in the background. But from a meta point of view, Bakuman's manga was published in Weekly's Shonen Jump, a magazine that also published Dragon Ball, Yu Yu Hakusho, To Love-Ru, Rurouni Kenshin (Samurai X) and of course, Captain Tsubasa to name a few.
it's belong to captain tsubasa, aren't it?
yep!