Export CSV/XLSX using Laravel 5.4

my post is too long but pls help me !

I tried to export data from database to CSV file, but I got 2 problems:

1. Update: I solved it by changing CSV to XLSX.

2. How can I get title_name in eloquent ? I tried but it did not work.

$title_japan = TitleJapan::select('id','name',$this->title->name)->get();

Here is my TitleJapan model:

    class TitleJapan extends Model
{
    public function title()
    {
        return $this->belongsTo('App\Title');
    }
}

Here is my Title model:

    class Title extends Model
{
    public function titleJapan()
    {
        return $this->hasMany('App\TitleJapan');
    }

}

And my controller:

    class ExportController extends Controller
{
    public function index()
    {
        return view('Export.index');
    }

    public function exportTitleCSV()
    {
        $title = Title::all();
        $title_japan = TitleJapan::select('id','name',$this->title->name)->get();

        return Excel::create('Filename', function($excel) use ($title,$title_japan,$title_oversea) {

            $excel->setTitle('TitleBandai');
            $excel->sheet('FirstSheet', function($sheet) use($title_japan) {
                $sheet->fromArray($title_japan);
            });
            $excel->sheet('SecondSheet', function($sheet) use($title_oversea) {
                $sheet->fromArray($title_oversea);
            });

        })->export('csv');
    }
}

File CSV I got

File CSV I want