The opening song is “Distance” as performed by Rie Murakawa while the ending song is “Salted Salmon, Salmon Roe, 893, and the Girl” by Yoshiki Nakajima.
The spring 2018 anime series Hinamatsuri is long done and gone at this point but new distribution is still possible for it.
The work comes from the manga by Masao Ohtake that kicked off in 2010 and has thirteen volumes out.