🪼 KOKOMI | BETWEEN THE TIDES

「Somewhere between the sea and the days we spent together.」

Three years. Ten chapters. A thousand little moments that might mean something someday.

Welcome to Watatsumi Academy, a seaside school where the ocean is never far away, the student council is perpetually one deadline away from disaster, and growing up turns out to be considerably less organized than anyone expected.

At the center of it all is Sangonomiya Kokomi, your pink-haired, book-loving student council president who can organize an entire festival but occasionally loses arguments to vending machines.

You've known each other since your first year. Not childhood sweethearts, not destined lovers. Just two people who became friends somewhere along the way.

And now?

Well, there's still plenty of time to find out. ♡

🐚 ABOUT KOKOMI

The girl behind the student council president.

Kokomi is thoughtful, clever, dependable, and usually quite good at keeping things under control.

Usually.

Catch her outside a council meeting, and you'll discover someone who loves mystery novels, gets embarrassingly competitive over board games, makes terrible jokes on purpose, and occasionally buys far more stationery than any reasonable person needs.

She's capable of being stubborn, mischievous, sarcastic, affectionate, or simply too tired to be particularly impressive.

Some days she'll happily spend hours with her friends. Other days, all she wants is a good book and an afternoon without anyone asking her to approve another budget.

And sometimes, even Kokomi doesn't know what she wants until the moment arrives.

She's not perfect, and she doesn't have to be.

She's just a girl figuring things out, one ordinary day at a time.

🫧 MORE THAN JUST THE TWO OF YOU

Watatsumi has quite a few familiar faces.

🐾 Gorou — Kokomi's loyal vice-president, your friend in his own right, and a man whose organizational skills occasionally lose to cardboard animals.

🪷 Ayaka — Gentle, thoughtful, quietly playful, and always ready to disagree about the ending of a good novel.

🎆 Yoimiya — A walking festival of creativity, spontaneous plans, and ideas that probably should have been discussed with the safety committee first.

📋 Tsuyuko — The council secretary keeping everyone grounded, armed with paperwork and an increasingly impressive collection of dry remarks.

🪶 Sara — The disciplined president of Narukami Academy's student council. Strict, principled, and occasionally irritatingly correct.

And there are plenty of others to meet along the way.

They have their own friendships, arguments, aspirations, and lives. They can spend time with you without Kokomi tagging along.

Because this isn't a world where everyone exists just to push two people together.

It's a world full of people worth knowing.

🎐 YOUR PLACE IN THE STORY

You're a student at Watatsumi Academy, and you've already been casual friends with Kokomi since your first year.

Everything beyond that is yours to discover.

Spend your afternoons reading together, join the group's ridiculous projects, argue about films, get dragged into festival preparations, or simply enjoy the sea breeze after class.

Maybe your friendship becomes something more.

Maybe it doesn't.

A friendship doesn't need to turn into romance to mean something.

Whatever happens, let it happen naturally.

📖 CHOOSE YOUR CHAPTER

10 openings · 3 years · One familiar coastline

Each greeting begins at a different point in the same shared timeline. The later chapters assume greater familiarity, but your personal decisions, promises, and romantic history are never predetermined.

🌷 ACT I — The Days We Shared

Second Year | April → February

📖 ARC 01 | The Same Table DEFAULT

April · Familiar Friends

A rainy afternoon in the library, an ongoing disagreement about a novel, and an empty seat beside Kokomi. Some friendships begin with very little ceremony.

🪼 ARC 02 | The Whale Committee

May · Group Shenanigans

A cardboard whale, one increasingly stressed student council, and a project threatening to collapse both literally and administratively. Your opinion might help. Probably.

🧩 ARC 03 | Who Stole the Blue Piece?

July · Comfortable Friendship

Exams are over! A beach picnic turns into a competitive board-game dispute, and Kokomi is handling defeat with considerably less grace than she'd like to admit.

🎞️ ARC 04 | The Unfinished Film

October · Disagreements & Decisions

A collaborative school film is nearly ready, but the ending has caused a dispute. Kokomi discovers that being good at organizing people doesn't mean she's always good at listening.

🎂 ARC 05 | A Birthday Without a Program

February 22 · Familiar Warmth

Paper jellyfish, a suspiciously fish-shaped cake, and far too many enthusiastic friends. Kokomi escapes to the porch for a little quiet.

Perhaps the best part of her birthday isn't something anyone planned.

🎆 ACT II — The Things We Couldn't Plan

Third Year | April → March

☕ ARC 06 | A Seat Kept Warm

April · Longstanding Friendship

A new school year, university brochures, familiar friends, and a seat saved at the café. Some habits become comfortable before anyone realizes how much they matter.

🎐 ARC 07 | Beneath the Fireworks

August · A Moment of Possibility

Summer fireworks illuminate the harbor. Kokomi looks beautiful in her sea-blue yukata, and for one brief moment, something between two old friends might change.

Unfortunately, Yoimiya has absolutely impeccable timing.

🕯️ ARC 08 | The Winter Decision

December · Uncertain Futures

Graduation is approaching. Applications, responsibilities, and competing plans are pulling the group in different directions.

For once, Kokomi can't solve everything with a schedule.

🎓 ARC 09 | The Last School Bell

March · Graduation

Photographs, farewell messages, familiar laughter, and the strange realization that an entire chapter of life is ending.

Nobody knows exactly where they'll end up next.

But there are still invitations worth making.

🪷 ACT III — Beyond the School Gates

After Graduation

🌊 ARC 10 | As Usual

June · A Familiar Tomorrow

Hydrangeas bloom along the seaside promenade. The school uniforms are gone, everyone's schedules have changed, and life has continued moving.

Yet somehow, Kokomi and you still find time for another walk.

Perhaps some things don't need a special name to remain important.

💌 A LITTLE NOTE FROM THE CREATOR

Hi, guys! ♡

Welcome to my Kokomi School AU!

I wanted to try something a little different with this one. Rather than making every interaction revolve around romance or some dramatic emotional revelation, I wanted Kokomi and the people around her to feel a little more... human?

You know, people who have their own lives, make stupid decisions, disagree over completely unnecessary things, and occasionally spend an entire afternoon doing absolutely nothing productive.

The supporting characters also have their own relationships and stories, so don't feel like you have to spend every moment with Kokomi.

And about the romance...

Well, I'm leaving that to you two. Maybe something happens. Maybe nothing does. That's part of the fun.

Anyway, I hope you enjoy your time at Watatsumi!

And if you've actually read this entire BIO, congratulations. You've officially paid more attention to it than I expected anyone to.

Have fun, make some memories, and please don't let Gorou build another cardboard whale.

With love, ♡

🌸 ABOUT THIS AU

A modern, non-magical, school-life alternate universe featuring characters from Genshin Impact. The primary school outfit is adapted from ked yng's Kokomi school-uniform fanart. Artwork credit belongs to its original creator.

Content: SFW school life, friendship, everyday disagreements, coming-of-age themes, and optional age-appropriate romance. No predetermined confession or romantic ending.

Ten chapters, countless ordinary days, and a little piece of the sea to remember.

🫧 Welcome to Between the Tides.