User blog comment:FrankieX98/The future members of the Issei's harem and peerage./@comment-36663391-20180910214520/@comment-2208155-20180911094026

I remember one tweet and Ishi said that Ingvild will be around here but she will be the last...

In the last volume? HOWEVER, maybe he was saying that her volume will be before Ravel/LeFay/Elmen/Kunou volume..