>>16 First option also gives Trust increase at the end. Dunno if second gives Trust first and then Trust at the end.

Lumina square movie theater. Harumasa asks if we want to see a movie, say "yes", said "funny movie" and it was really funny" for significant trust increase.

>>18 I find it funny that for some of the characters (been mostly male ones at this point) they don't have all of the invite options despite having access to them for like days

Lumina: W/ Lighter near news stand > Are your two...? (no extra increase) > Alright alright no more arguing? (no extra increase) Increase at the end I believe regardless of selection

lumina square invite with cat event: not scary -> 1st option -> cat can be unpredictable for significant trust increase

Invite event: Port Elpis. If you choose Fishing (the one that'll take you near the fishing spot), choose "I won't laugh" gives Significant Trust.

Port Elpis - On the Dock with the Kids; Choosing the second option after the kids leave gives trust increase

lumina square encounter with seth: suggest petting seth didn't give additional trust but after completing gave trust increase.

lumina square playing with cat: i picked try meowing and pls meow which didn't give any trust but after completing, i got trust increase.

Is it just me or his encounter is very rare? I've been changing time so many times but i only got his encounter once

For the invite event to Port Elpis, if you choose to get fries, you can select the option "It's a good job you were here" for significant trust increase.

Lumina Square in the play park: 'Look at Harumasa worriedly' gave Significant Trust

Lumina galleria invite: family member -> am I really a family member now gives significant trust increase

>>4 You can also invite him to the second floor and say "It is!" for Significant Trust.

in port elpis, near dock (harumasa and 3 other NPCs), pick "Fortunately they managed to hold on" for significant trust

infront randomplay encounter: pick the choice to second floor, and pick "it is my room" for significant trust

>>1 Say, “I’ll have what you’re having” then say “I’ll drink it”. This gives significant trust.

encounter harumasa next to lighter in lumina city, selecting "you guys have a great relationship" gives no additional increase, but was given a trust increase at the end of the encounter regardless of the choice.

encounter harumasa infront randomplay store, pick "we can open store together" or something for significant increase

For the invite event at Port Elpis, wait quietly rather than adjusting his headband for a significant trust increase.