It was more or less amicable… if you disregarded the rampant slavery that was going on (Portuguese were big in the Asian slave trade, and feudal Japan was a hellhole- though fwiw the highest authorities on both sides seem to have been horrified by it and sent missives in that regard - the Japanese for obvious reasons, and the Portuguese due to concerns it was affecting evangelization).

The Portuguese authorities eventually tried to ban the east Asian slave trade (because they wanted to continue trade relations and there was real risk of being locked out).

Relations with the Japanese otherwise seem to have been peaceful, which honestly is kinda surprising considering how they infamously behaved across the entire Indian ocean and even initially in China (tons of piracy and slave raiding on coastal towns).