#nanatsu

In the chapter 128 of the manga, there's a scene with Natori and Natsume in a train.

Here, Sensei is complaining to Natori about why he is taking a train, where he is getting noticed by his fans. To this, Natori says following:

"Hehe, yeah, because I'm a romanticist, I think I can't let go of my habits from my student days. When I'm in a crowded place like this, I always wanted someone, who could also see the youkai to come to me and say "Ah, that gecko of yours!".....one day..."

So Natori is saying that the reason he wanted to be in a public and even probably the reason he became an actor in the first place, was for someone like him to find him. Now, let's look at what happened with his first meeting with Natsume?

Natsume is wondering aloud if Natori's gecko is a tattoo. Natori notices this, as seen by the third panel. Sadly, this was edited in the anime, where Natsume instead only thinks about the gecko (and Natori doesn't look back at him).

So we can conclude that what Natori said in the chapter 128, was very likely meant towards Natsume, that he has been waiting for years to meet someone like Natsume. When connecting that to how Natsume wanted to find someone who could see youkai too, it's kind of clear this is a soulmate relationship, at least to me.

I really want them to refer back to the meeting scene later on to make it more obvious.