渋谷DAYS＠ ～渋デジ探偵．COMシリーズ

Main character is a detective. One day a girl that he admires applies to his place to search for her missing brother. She tried to investigate the case herself together with detective club friends, but they got attacked themselves as a result. With the appearance of a thief stealing paintings case expands. Where will investigation lead?

[From vndbreview]