Any way, when he learns of the fact that ghost take people with them and they go about it by getting close to them, this makes him more of a pain in Mari’s sides every single time she goes off into the field of Eden with Rie. The field where Rie talks of her life with yuri to Mari and through which interactions they grow closer to the point of Rie’s feelings shifting and Mari’s growing to the point of Rie now wishing to stay for not Yuri’s sakes but for Mari and wishing to love her. But of course Mari is sceptical thinking, as we all would, that Rie is only seeing Yuri in her and that she doesn’t actually love her. But Rie insists saying that things are different now. I guess sometime passed since they started hanging out but as you know it’s always difficult to tell in movies. Then again, seeing the way that Mari has opened up to the other students it’s safe to say some marginal time has gone by. So while it might look sudden, it actually isn’t.