According to the notebook left on his desk, Yuu was doing some research for Kei Amakura.
His notes are full of accounts of old urban legends, and newspaper clippings about disappearances and people who were "spirited away".
RN:Yuu's research
Rei's notebook: Yuu's research
Replaced by: Disappearances
Obtained: Going to Yuu's Room and reading the research notebook on his desk.
Type: Incidents
優雨の机の上に残され
ていたノートによると、
彼は、「天倉蛍」氏か
らの依頼で、何か調べ
ものをしていたようだ。
ノートには古い都市伝
説に関する記述があり、
「神隠し」や「失踪事
件」の新聞が挟まれて
いた。