僕は秋子に借りがある

From Author Wars - https://authorwars.com/books/pu-haqiu-zi-nijie-rigaaru-2873780.html

Overview:

Title: 僕は秋子に借りがある
Author: 森博嗣
Year: 1999
Type: Short Fiction

Variant Titles:

2014. I'm In Debt to Akiko