Kazoku no Uta (2012)

Kazouku no Uta reminds me of the main character in Marumo no Okite because both adopt kids and learn to live as a family. (although in Kazoku no Uta they are his [Odagiri's character] real kids.

both have to deal with kids. and both mens are musicians :)

Another messy artist has to deal with an unexpected enlarged family..

Both are about washed up musicians who now host a radio show...when the daughter(s) they never knew they had show up to live with them.