MunuAnimationManager.cs

using UnityEngine;
using System.Collections;

public class MunuAnimationManager : MonoBehaviour {

	[SerializeField] private GameObject helpButton;
	private Animator animator;
	private bool isClosed = true;

	void Start(){
		animator = GetComponent<Animator> ();
	}

	public void ClickMuenuButton(){
		if (isClosed) {
			animator.SetTrigger ("Open");
			animator.ResetTrigger ("Close");

			isClosed = false;

			//ヘルプボタンの描画順をメニューの裏に変更
			int myIndex = transform.GetSiblingIndex();
			helpButton.transform.SetSiblingIndex (myIndex - 1);
		} else {
			animator.SetTrigger ("Close");
			animator.ResetTrigger ("Open");

			isClosed = true;

			//ヘルプボタンの描画順を最後（表示の一番上）に戻す
			helpButton.transform.SetAsLastSibling();
		}
	}
}