Teacher's Memories (spoilers, if you are reading, but you would not be surprised by anything, really)
Nagabe is a master of subtle gesture and pacing and delicate line work, but if you were the slightest bit impatient about when things might actually be happening, this is the volume. So Shiva is a Child of Light and Teacher is/was a Cursed one, but her protector, and they have been pursued by the leader of the Church (something like the Pope). In this volume I was suddenly reminded of Philip Pullman's His Dark Materials series where something like The Catholic Church wants to take the souls of children.
So, to save Shiva's soul, Teacher reveals the depth of his love for her in giving up his own soul for her (which I know, sounds like the Biblical story of Christ's sacrifice on the cross), which results in the (gradual) loss of his memories, including his memories about her. It is anguishing to see Shiva realize this as she tears at her chest, wanting to remove what he has given to her. Then the Church captures her and takes her away, imprisons her. In this moment we see more than ever the love she has for him. In prison, someone, we know not who or why, gives her the Teacher's pocket watch, which has been inscribed to her. I think volume nine is available in English soon. Clearly, anyone reading volume eight will drop everything to find out how things proceed. In volume eight there are moments you will remember, for sure.