Cup of Destiny and Rebirth

Twenty years have passed since the Holy Grail War in Fuyuki City. Now, in HF City, which has been developed with the efforts of the entire province, the power of the entire region has been gathered together, and a new Holy Grail has been quietly born here. Around it, many forces began to secretly entangle—— The Einzberns, an ancient family of magicians, a government agency intent on studying the Holy Grail, a villain who is eager for fame and fortune, forgetful about profit and afraid of death, and a "troublemaker" from the clock tower who is responsible for monitoring and preventing problems with the Holy Grail... In addition, there are also girls, high school students who are accidentally involved in this vortex, and the supervisors of this Holy Grail War? ! Does this new "Wild Holy Grail" breed completely different rules of the game? Masters, are you willing to abide by the rules? Servants... Are they really normal? And the most important thing is—— Holy Grail, is there really no problem?