Rin and Maddy are childhood friends that are inseparable and when they were fourteen Maddy started to transition into a boy and changed his name to Nathan. What will happen when Rin realizes that he's in love with his best friend that's a boy.
(and by the way I'm not saying that there's anything wrong with being gay with that last part what i mean is that Rin always thought he was straight and also Nathan is trans ftm and gay where he only likes boys)