 If you liked
Koori ga Tokeru no wo Matteru
|
 ...then you might like
Gotou-san wa Ore wo Kaitai
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Nearly identical stories. A shy and dark-haired salaryman approaches a young boy at a gay hotspot/bar and picks him up because the boy reminds the man of his first love. The duo begin a purely physical relationship with gradually results in the boy getting more and more attached to the older man.