佐々々奈々の究明（上・下）Investigation by SASASA Nana (Volume 1 & Volume 2) - MORIIZUMI Takehito

叔母が消えた8年前、人里離れた山荘で何があったのか？

叔父が暮らした山荘をおとずれた流々は優しかった叔母のアヴィーが失踪した夜の記憶を取りもどす。8年前のその失踪直前、アヴィーはボート小屋で男と密会していた。流々が姉の奈々と「男」の正体を捜査しはじめたとたん山荘に火が放たれ、関係者にも魔の手がせまり……

ひとりではコーヒーも淹れられない生活音痴のミステリ作家・奈々と、
そんな姉が大好きすぎる大学生の妹・流々のコンビが送る《姉妹ミステリ》、開幕！

What happened at a cottage in the middle of the woods eight years ago when her aunt disappeared?

Sisters taking on a missing woman case are a mystery writer and a college student.

Ruru visits the mountain villa where her uncle used to live.
She regains her memory of the night her loving aunt Avie disappeared.
Just before her disappearance eight years ago, Avie had a secret meeting with a man in a boat cabin far from the cottage.
Who was that man?
Is Avie happy now?

Just as Ruru and her sister Nana begin to investigate the identity of the “man,” a fire is set at the cottage and the people involved are under the influence…

Nana, a mystery writer who can’t even make coffee by herself, and her university student sister, Ruru, who loves her too much, take on a case together in their first mystery!