some of the earlier works of suda51 are often called included in the "kill the past" meta-series because they share the same charachters (often with different names/identities, but it is implied that they are the same charachter) and a similar theme. The main theme in Kill the Past titles is the necessity for their protagonists to destroy relics of their past that burden and prevent them from moving forward. Oftentimes, characters find themselves at odds with previous events in their lives that must be confronted head-on for them to be at ease.
kill the past games are:
The Moonlight Sindrome (the suda51-directed spin-off to the twilight sindrome saga)
The Silver Case
Flower, Sun & Rain
Silver Case, 25 Ward
Killer7 was going to be part of the kill the past series, some of the earlier trailers show some charachters from the other games (i remember seeing Sundance Shot from FSR), but due to the capcom influence the script of the game was heavily reworked. however, t still retains a lot of themes from the KTP games.
for some FSR plot analysis and speculations and for more info on KTP i recommend you this fansite: http://www.paradisehotel51.com/k7sin/hotelfsr/
and their forums. they recently moved from another hosting so not all their oldmaterial is up, and it's really chaotic, but i found a lot of informations.