Ren agrees to take Mana around to see the town, but she's anxious about and uncomfortable around Monster Strike.  When Ren gives her a MS ring, however, she gladly accepts it, thinking it's an engagement ring.  When she realizes her mistake, she runs off in shame... and that's when a monster makes it move.
I'd rather say that ring 
was an engagement ring.
wenn das wirklich
ein Verlobungsring wäre.
podría decirle que sí era
un anillo de compromiso.
podría decirle que sí era
un anillo de compromiso.