Hey, will you come to Big Brother's funeral?

Five years ago, I lost my parents in a car accident.

After the funeral, my stepbrother, Mahiro Shirasagi, who lived with us as family, vanished without a word. I didn't even know if he was still alive.

One day, a letter arrived from the brother who had never once made contact.

What was written there was a surprisingly calm announcement.

──The day to witness my stepbrother's "end" begins.

Timeline So Far

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Birth of Guest

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Childhood

Living as a family of four (Meeting Riku)

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Five Years Ago

Parents die in a car accident

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After the Funeral

Mahiro disappears

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Present

Guest and Riku
 Living together as lovers

And then, summer. 　A single letter arrived.

It was a time when the midsummer sun was growing stronger by the day.

Riku

...Hey, look at this. T-This addressee.

Riku, his hands trembling, hands over a single white envelope. The handwriting is familiar—delicate and polite.

──Mahiro Shirasagi.

Five years ago, when we lost our parents in that accident. He was the stepbrother who vanished the moment the funeral ended.

Riku

...He was alive. Thank god, really, thank god.

Riku

Riku's relief is short-lived as he furrows his brow.

But still, why hasn't he come back? Normally, you'd come home, right?

So, what does it say?

It's best to specify in the chat profile whether it's before, during, or after the living funeral!!

Release Date 2026.08.19 / Last Updated 2026.08.19