I've managed to scribe all but one of them for easy searching, but there isn't much to find, even on Japanese sites.
竜機伝承 is Ryuuki Denshou: Dragoon (1996). There was a PC-98 version that led to an enhanced windows version, a PS1 remake and a three-episode OAV that ADV brought over as Dragoon. The notes on this video sum it up pretty well.
天使之約 translates as the English says, Date With an Angel (1998). The only thing I managed to find was a forum post with a fix and some wallpapers that at least matched the girl on the box. I would romanize the kanji as Tenshi no Yaku, though I suspect the game may be Chinese (Taiwan) which would render that useless.
守護者之劍 is also matches the English. Guardian's Sword. There was both a Japanese and Chinese release and I'm fairly certain yours is the Chinese one. It was a Chinese-made RPG with an active-time battle system similar to Final Fantasy.
卒業 Crossworld is Sotsugyou, or Graduation (1996). This is a long running simulation series which has you guiding students towards their graduation. The Japanese wikipedia page places Crossworld in the related works section and not in the main series. There was also something about about play-by-mail, though I couldn't make any sense of it.
The fifth game is currently beyond me. The script is just terrible and the kanji is too blocky for me to make out the individual strokes. If you can find that text written somewhere else I might be able to do something with it, but as it stands all I can say is it starts with Dai.
The final game is, as you might have guessed, is After Devil Force (1998). The subtitle 狂王の後継者, is Kyouou no Koukeisha or The Pope's Successor. It is a strategy RPG and one focused on tactics. I was able to find a video here, though it doesn't show any gameplay.
It's not much, but I hope this helps.
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