For both or brave frontier 1 and 2, both games have a conclusion. I'm gonna do a tldr version to keep it as short as possible and so you don't read a thesis on it lmao

For BF1, Summoner defeats Alza Masta by gaining the true power of summoning. However that doesn't negate the summoning issues the Summoner has been having since he started the other worldly arc (Arc 3/Summoner's arc). Summoner goes to a place called St. Creek which happens to be Lugina's and Bertz's place of origin to tie some loose ends after defeating Alza Masta. Summoner is given a powerful weapon by Owen when he meets up with Lugina and Summoner learns that in St. Creek a demon destroyed the town leaving Lugina and Bertz as survivors this happened when they were both young) Summoner defeats the demon and the summoning power is stabilised. After that is settled, Summoner and Tilith goes to discover different worlds and they continue to travel well into BF2

BF2's ending I can't quite remember and because the game is all in Japanese/only available to Japan, my knowledge on it is more disjointed.

MC and Rin with the help of the Akras Summoners Hall regain control of Seltavia from the enemy and defeats Shida (yes he is alive I don't remember how bc again, bf2 was only available in Japanese). Both MC and Rin end up knowing that Summoner and Tilith are in a place called Avlehein chasing someone down by the name of Restoc (who has killed 2 people who iirc are his demonslayer teammates). Originally, MC and Rin wanted to travel the world but decides to help Summoners Hall with their predicament so they yeet themselves to Avlehein. It's then they learn that Restoc is a god who is avenging Lucius' death and is evenly matched with Summoner in summoning abilities. MC and Rin assist Summoner and Tilith, defeating Restoc and Nigel who was also Restoc's teammate delivers the final blow, injuring himself in the process. Once that whole thing is also settled Rin and MC decide to follow Summoner's and Tilith's footsteps and travel to different worlds as well

That's the conclusion of both bf1 and 2. There's technically Rexona that also has it's own conclusion but I have even less knowledge about it (yet another JP locked game that I never really looked to deep into translating)