PC Translation of Yasumi's route is in progress here.
Note: This site is for a cursory translation of the Web Novel for
Aoishiro, a Playstation 2 game by Success
After re-reading this while translating Yasumi's route, I've realized quite a few portions are incorrect!
I've fixed some of it, but please play the PC translation when it's done instead!
The web novel follows one of Yasumi's routes in the game.
The Yuri-hime manga is a 3-part prequel focusing on Momoko and Yasumi's dorm life before the summer trip.
The Comic rush manga appears to follow Nami's route through the game.

My grandmother, who died a long time ago liked to travel.
Unfamiliar places.
Unfamiliar people.
She really liked encountering things she didn't know about.
Just like the saying, that if you're raised in a place with a tall ceiling you'll grow tall.
If the world's things become larger, people become larger.
And then, in the summer of the 2nd year of high school, I went on a long trip.
Though it was a training camp for school, it was no different than a trip.
Traveling by train then bus, we traveled to the southern sea.
With my sword and equipment in my bag, I traveled to the cape of Onigashima to the temple gate.
And there, I met...
The waxing and waning of the moon, the coming and going of the tide
The fate that disturbs the period of the water's surface
The lapis lazuli capital of the dozing dragon, the tempting storm that challenges me
The endless waves, the pulse of the sea god