Yes, you can change Alliance Leader.

If you want to change Alliance Leader, you can promote an Alliance Member to R5, to make he/she the next Alliance Leader.

When you change Alliance Leader, the current Alliance Leader will be demoted to R4.

■ How to change Alliance Leader

- [Lower menu on main screen] > [Tap on Alliance Flag] > [Alliance Members] > [Choose R4 member] > [Promote]

■ If your Alliance Leader is Inactive

If your Alliance Leader did not log in for more than 14 days, 

Active R4 members with the highest Power Lv. will become R5.

If there is no R4 member in the Alliance, 

it will be passed to the lower Rank.