Ok I have been stewing on this for a while, and have decided to add something to my campaign: this will apply to any character whose class is outside Summoner or Warrior Summoner. A Creation Point will be required to use Summoning skills. I'm going to establish that any character who wants to develop summoning skills must first spend 1CP to acquire specialized Learning in a specific area (occult). This is mainly because summoning requires specialized knowledge and a great deal of study and preparation to learn. This training would be inherent to the summoning classes mentioned, and since the art is so powerful, such knowledge would be guarded, and only the most ardent seekers would be able to obtain usable grimoires.
This makes summoning run parallel to other supernatural abilities in terms of investment and availability. I just don't like the idea that any brute can take up summoning just because they feel like it, or they got ahold of one book somewhere - they are bored, and decide to spend the next level's DP to become a part time demon summoner.
I'm not really comfortable with this... Even in non-anime fiction, the only characters who can perform effective summoning are skilled/knowledgeable occultists. Those without proper knowledge seem to only be able to accomplish disasters and unleash harmful forces, which is the mainstay of a certain horror genre.
Has anybody else out there seen a bit of a problem with open access to summoning?