So, I have vague memories of reading this manga with an INCREDIBLE plot...

There's this genius/frustrated painter who starts painting pictures of a young homeless couple having sex in the park near his home. They're an immigrant couple (from South America, I think?) that are homeless due to the economy and have nothing better to do all day than to make love with exquisite tenderness and passion, which they do all day, everyday, almost around the clock. They're madly in love with each other. The artist... kind of goes a little crazy about them, too, and becomes obsessed with painting them, no matter the cost to their privacy or his own sanity. He goes and spies on them in the park whenever he can, and regularly uses what he sees in his paintings. He gets more and more obsessed, until in the end, he does something stupid...

I can't remember exactly what stupid thing he did, but I think the story ends with him destroying the very beauty he had wanted to capture... He says/does something that either causes the young couple to separate or just to not have sex in that park anymore. Maybe he only got caught spying on them? But either way, I remember feeling really sorry for the couple, for having their most intimate moments "stolen"... And for the artist, too, since he's so pathetic.

Can anyone help me with identifying this? I'd really appreciate it!

I'm sure it's one of these two.

Jiraishin
Abandon the Old in Tokyo

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It's definitely Jiraishin, but it is only one specific story in the manga, which lasted like one chapter. It was in the first volume I believe.