Details * April 26, 2019 (Japan) * Japan. * Japanese. * Showten. Ano Danchi no Tsuma-tachi wa … The Animation (2019)

The soundtrack is minimal. Most of the game plays in ambient silence—only the hum of an air conditioner, the distant sound of a train, or the buzz of a fluorescent light. Then, when passion ignites, a soft jazz piano or a melancholic synth wave kicks in. The contrast is jarring and effective.

You're referring to "The Animation: Portable" (also known as "AnoDanchi no Tsumatachi wa The Animation: Portable"), a Japanese adult visual novel game developed by Spiral.