Tantei Kibukawa Ryousuke Jikentan 'Awayuki wa Hi no Kanashimi'

By the middle of December, during the end-of-year cleaning at the Kibukawa Detective Agency, Izuna Sagishima and Masao Ikurumi discovered a hidden document in the office.

It was a record of a tragic event left behind by the former detective assistant, Ryoji Sagishima, who had once worked at the agency.

What was he trying to tell us, and what did he want to leave behind...?