Final Fantasy X/Kilika

Quite sad really, isn't it? Use the Save Sphere once you've disembarked from the ship, then follow Yuna and co. further into town. You get to watch a pretty cinematic sequence where Yuna performs the sending, and Lulu explains the significance of it. Afterwards you'll rest in the inn, then once you've got control of Tidus again, leave. Head back to the previous area to talk with Wakka, and afterwards you can check the remains of the hut on the left to find a woman who'll sell some weapons and armour to you — the weapons all have Sensor, and the available armour for everyone all have HP +5%. As you leave the old lady shopkeeper there will be a hut north of you. Go inside of it and on the table you can get the Al Bhed Primer IV. Once you have that, head back and go past the inn this time. If you interact with the boy standing in the ruins of the house to the left here, it'll start to crumble and you'll save him (a good deed for what you're about to do). Check the house on the right behind the inn you came out of. Inside there's a chest on the left that contains 3 Potions. That's right, you're robbing a house that's just been struck by a giant monster that destroyed and killed half of Kilika. Despicable. For what, 3 Potions? Anyway, leave and carry on up to Kilika Woods.