Hikikomori Sekai no Tantei Jikenbo #01 Maria-sama ga Miteta Satsujin Jiken

引籠世界の探偵事件簿#01 マリア様がみてた殺人事件 is a visual novel developed by Unknown, released on TBA. Player rating: N/A/10. A retired detective passes a request to the young girls detective club. It's a letter with threats with the sender being one from the girls school....