Sex dainamaito: Madonna no Shizuku (1988)

Plot

A gloomy private investigator scrapes by, sifting through the garbage of love hotels to crack his cases. Everything changes when a carefree, spirited young woman moves in next door. Her untamed energy and warmth begin to chip away at his hardened, lonely world, sparking an unlikely connection that could pull him out of his downward spiral—or send them both tumbling into new, unexpected trouble.