Disgaea 4 Complete+ Unforgotten Melodies Remastered - Piano Sonata No.D4

Piano Sonata No.D4 is track 7 of the Unforgotten Melodies Remastered OST, which you received if you pre-ordered the HL-Raising edition of Disgaea 4 Complete+ from the NISA online store (which I did; in fact I received my copy on the 28th.)
The composer is Tenpei Sato.
I do not own the song.

[@Crimsonchado]

This chapter theme was so godlike.

[@berserkingsoul9767]

felt soo epic ~!