This question already has an answer here:
When I was younger like 6-7, I used to watch an anime.
There was a guy, he looked more realistic than other animes. I remember something that he could spawn down monsters (I remember one monster which was like a floating eye something like that). I also remember in later episodes that they would bunch up as a group, the guy, a girl kinda the same age as him with both an older guy and a woman.
I remember tiny parts of some episodes like one they would be running from the bad guys on roof tops or something like that.
I also remember that in one episode, the two guy were going on a dive to a boat wreck, the younger one passes out and is about to drown but the older one saves him and gets him back up.
I used to watch the anime on a French channel on TV, it was dubbed in French.