Authorship and composition, read through Timely!!.
“Remember Summer Days” is cataloged here as a written musical work, separate from any particular performance, recording or physical issue. The documented words and music are both credited to Toshiki Kadomatsu. Keeping these roles explicit makes it possible to follow the authors even when a performer’s name is the most prominent name on a release.
The song began as the 1983 B-side of Kanashimi ga Tomaranai. Its explicit album-related link in this catalog is to the expanded 2008 FLCF4243 edition of Timely!!, where it is track 11. It is absent from the original LP program. The work entry therefore follows a composition across a later album reissue without moving its origin onto that album.
The explicitly linked edition positions are FLCF4243 / 11. Those positions tell us where the associated song is listed; they do not demonstrate that every issue uses an identical performance, mix or master.