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The Japanese Wife Next Door (2004) is a Japanese adult comedy directed by Yutaka Ikejima that belongs to the "Pink Film" (Pinku eiga)
The story takes a turn when a new family, the Iwatas, move in next door. The Iwata family consists of a young couple, Masakazu (played by Tadanobu Asano) and his wife, Yuri (played by Yui Narumi). Seki and Shizuku become fascinated with the Iwatas, especially Yuri, who becomes the subject of Seki's observations.
"Part 1 is Better"
: Community reviews on Letterboxd often note that the first film is superior to the second.