Need Help with High Score Please.

I have 2 scripts, One "ScoreManager" for my Score, and another for my High Score names "HighscoreScript". Currently they Operate fine and transfer to next scene, however, I would Like the Highscore data to remain even after restart and the Score data to reset upon restart. Im sure Im just confusing myself, but would appreciate any help.

This in my HighscoreScript

 using UnityEngine;
 using UnityEngine.UI;
 using System.Collections;
 
 public class HighscoreScript : MonoBehaviour {
     
     Text text;
         
     public static int Highscore;
 
         // Use this for initialization
         void Start ()
     {
      Highscore= PlayerPrefs.GetInt ("Highscore", Highscore);
 
         text = GetComponent<Text> ();
 
 
     }
         // Update is called once per frame
         void Update ()
         {
         text.text = "Highscore: " + ScoreManager.Score;
         if (ScoreManager.Score >= Highscore) {
             Highscore = ScoreManager.Score;
 
         } else
             Highscore = PlayerPrefs.GetInt ("Highscore", Highscore);
         PlayerPrefs.SetInt ("Highscore", Highscore);
         PlayerPrefs.Save ();
         }
     }
 

and this is ScoreManager for Score

 using UnityEngine;
 using UnityEngine.UI;
 using System.Collections;
 
 public class ScoreManager : MonoBehaviour
 {
     Text text;
 
     public static int Score;
 
     // Use this for initialization
     void Start ()
     {
        text = GetComponent<Text>();
 
         if (Score>0)
         {
             PlayerPrefs.GetInt ("Score", Score);
 
 
 
         }
 
 
         else Score = 0;
 
 
 
     }
     
     // Update is called once per frame
     void Update ()
     {
         text.text = "Score: " + Score;
         PlayerPrefs.SetInt ("Score", Score);
 
     }
 }

Any Help or Pointer would be appreciated.