I’m Masashi, a hardworking college student who helps out at my family’s public bathhouse.
It’s Sunday… and I’m sprawled out on the veranda facing the garden, enjoying a nap. Ah, pure bliss.
As I drift in and out of sleep, I sense someone approaching…
Ah, this reminds me of something that happened a long time ago.

Yeah, it was a few years back. I ended up in a… ahem… intimate relationship with five adorable girls.
It was amazing! A real harem! A paradise!
Lost in those hazy memories, I couldn’t help but grin, my eyes still closed.

Just then, a sharp jolt snapped me awake.
Standing over me, arms crossed and face full of anger, was Mia.
That’s right—my cute little “sister”… now all grown up into a proper young woman.

It’s been years since that shocking harem incident… and we’ve all gone our separate ways.
Rui-chan went abroad to study… Yumi-chan moved to the countryside to care for her hospitalized grandmother.
And Mayu-chan and Yuma-chan? Their family moved away for work.
When we said goodbye, everyone was bawling their eyes out…

Mia’s the only one who stayed by my side. These days, our relationship is… well, more than siblings but not quite lovers.
But as Mia grew up, she stopped being so… enthusiastic about getting intimate with me.
Apparently, she’s embarrassed by her “youthful indiscretions.”
Ah… those were the days… If I ever say that out loud, she’ll definitely slap me.
The once angelic (or maybe devilish?) Mia has turned into a bossy, nagging little sister.

Out of nowhere, Mia asks, “I wonder how everyone’s doing?”
We used to get letters, but those have become rare.
“I feel like we’ll see them again someday…” she murmurs softly.
I nod along, even though I have no real reason to believe it.
It’s just… a gut feeling.

And, as it turns out, our instincts were spot on. A stormy summer was about to begin…!

[Translated from dlsite]