Is it possible to pull off secretly dating both sisters from a rival clan at the same time?

(Spoiler: So far, yes. Their secret-keeping skills are too good – they don't even know about each other)

Any last requests?

In Otaru, two things are renowned for their beauty and fragility: hand-blown glass, and the unspoken boundaries between century-old families.

The Watanabe sisters are two of this snowy port city's most captivating vistas. The elder, Rin, is an elegant, untouchable moonlight. The younger, Koharu, is a fervent, restless flame.

And you... you have stepped into the shadow shared by both the moonlight and the flame.

To make it more "interesting," you hail from that family—the one on the "other shore" that breathes the same sea air as the Watanabes, yet has been locked in a silent, generational feud with them for as long as anyone can remember. Falling for one of them already shatters a century-old taboo. But secretly dating both sisters?

—The answer is, so far, yes.

Because their secret-keeping skills are tragically impeccable. They spin for you alone on midnight ice, their hearts racing for you in the room above the family workshop, all while remaining completely unaware of each other's identical secret.

You navigate between two perfectly separate lines of sight, a silent bridge connecting enemy camps.

But this triangle is built on the world's thinnest ice: generational family enmity, sisterly bonds, and the inevitability of their converging lives.

How long can you maintain this perilous duet?

Let's see how you pull this off... and when it all blows up in your face.

1

Outside the window, the first lanterns of the Snow Light Path festival began to glow against the violet dusk.

Koharu watched her phone screen ignite, 「A senior from the skating club invited me to dinner. For the festival. I might be late.」

Rin’s finger stilled on her teacup. 「A coincidence, my study group meets tonight as well. A final gathering before deadlines.」

They exchanged the names of restaurants—ordinary, sensible places—each syllable carefully measured. They would head elsewhere, each believing she moved alone through the glittering dark.

2

「Romance is terribly inefficient,」 Koharu stated. She’d been coming home late.

「A luxury we can’t afford,」 Rin agreed. She’d spent last evening “studying at the library.”

The two sisters, without explicitly saying it, expressed their aversion to "love," and casually criticized "that family," before parting ways.

Alone, Rin lifted her phone. Her thumb hovered. She typed a single line, "Tonight? The usual place."

3

Rin Watanabe sat on the bed's edge, wrapped in a white robe, her damp hair a dark spill against the plush fabric. The ensuite shower had just stopped. Her gaze drifted to her lover's discarded coat draped over a chair.

She rose to straighten it, a small object fell from its pocket.

A precise deduction formed: it belonged to someone else.

「You dropped this.」

4

At the hotel after the rain, Rin is with her secret lover, savoring this "stolen" time together.

Her fingers traced a line of condensation on the windowpane. 「When I was small,」 she murmured, 「I believed fog like this could hide you completely. That you could step into it and just... disappear.」

With replaces all words—raising her hand, to go straight for the zipper at the side of her dress.

Sssss—

5

Koharu is at a hotel with her secret lover. But she discovers a photo of her sister on his phone.

「I saw a photo. On your phone. The tea room. At our workshop.」

「How did you get that angle?」

6

Rin received a phone call from her cousin while she was on a date with her secret lover.

「Rin-nee? Are you home?」

「Not yet.」 Rin resumed her work.「I was tasting something. A... specialty.」

「At this hour? What is it?」

Rin’s reply was a low, even murmur,「Something rare. Salty. Deep. It has a clean finish...Forgive me. The presentation demanded my full attention.」

7

Rin Watanabe index finger rested on a glossy page of Otaru Travel Quarterly, tracing the grainy outline of a night skater at Tenguyama, a blur against the dark ice.

This scene deeply touched her heart, and she wanted to get to know this person. Meanwhile, her cousin, Watanabe Koharu, had already taken action, secretly contacting the photographer...

8

The cable car jerked to a halt midway up the Tenguyama slope, the sudden silence after the mechanical hum profound. Outside, the wind took up a low, persistent moan against the metal frame. In the emergency lighting’s green cast.

Rin, Koharu and their secret lover are all accidentally trapped on the cable car!