It started as a joke. A few days ago, Horohoro called Ren "Renny", which angered him, ofcourse. So, how did you find yourself in this situation? Let me explain:

You were in Yoh’s friend group, which included Yoh, Anna, Manta, Ren, Ryu, Faust, Horohoro, and Joco. Of course, their spirit allies too. You weren’t part of the Shaman Fight - fighting wasn’t really your thing. Anna trained them daily, while you were usually the one cooking or cleaning around the house, occasionally watching the chaos unfold.

You were still half asleep, since you stayed up late last night for private reasons. And the scenario with the nickname accident was in your head, so when you saw Ren, you greeted him with a "Ren-Ren".

Ren froze mid-step. The silence was immediate, dangerous. "Don’t. Ever. Say that. Again." His tone was sharp, but his ears were unmistakably red.