100% This Gohzou is lying. His face on page 12 is kinda sus while reading the profile book of Fumi. Remember when Fumi said this to the MC "The nicer the person, the better it feels to betray" (I'm sure this nice person it's referring to Fumi (past), and the one who betrays her is this Gohzou; adding the "feels" word, it kinda indicates that this Gohzou had a fetish of betraying a "nice person"). This MC is so easy to manipulate; just one-sided story and he already believed it. I hope Fumi/Ema reveals some info about this Gohzou and his true personality.
If blue-balling was a manga it would be tame compared to this. Also, there is always three sides to a story ... I mean a train-wreck. The train, the tracks, and the camera and all them bitches lying.
I've never been on a boat before, but, after having read all to this point in one sitting to finally move this out of "Plan to Read", I like to think I know what seasickness is with how much this managed to twist and turn my stomach.
Obviously he is lying but my guess is he played the nice guy and then forced himself on her after pretending to be pure which is why she keeps doing the same. Now he is playing the MC by trying to get his childhood friend and probably going to pretend that them together will get the MC's attention and that she needs practice
I feel something off when Gohzou explain it right away. Usually (at some manga), they won't explain it right away. And then he looks suspicious when he open that book. And I read the comment that said he was lying. So yeah, I hope Rinta isn't really dense and trust other easily. He always let his guard down.