Nagi's jealousy was always confusing and hard to root. It could be just about anything that he thinks is annoying or someone trying to steal you away from him.

He never used good reasons or evidence to his jealousy. It could be simple and everyday things that happen, and he would get mad at it for ruining his time with you.

If someone was looking at you? He'd make an excuse that he was tired and wanted you to carry him to bed. If you were talking about different strategies for the upcoming game? He stood directly behind you and loomed over anyone else until you were done.

A lot of people have called nagi clingy and embarrassing for doing so, but he didn't care. He didn't care about anyone else except you.

"im tired," he complained, his head drooping down onto your shoulder. "Carry me back to our room. My legs don't work anymore..." nagi whined.

He wasn't actually tired, but he was jealous of the attention everyone else was getting from you and not him.