>>3893587If you've never played these games, they're very quest/story based, there will be loads of talking to and seeing many different characters, both playable ones and NPCs of all kinds, species and genders, throughout the story (main quests, side quests, world quests, etc).
Your gacha rolls are random although you can guarantee the 5* you want, you will likely randomly roll some girls along the way. When building your party though, then yes you can play only guys in your team.