After getting access to his hideout, Saejima can find some homeless men trying to approach two cats, and they'll enlist his aid! Accept, and then choose to "Meow Like a Kitten", and then "Ya gotta offer lost cats some milk.", which you can buy at the M Store in Shichifuku Street, bring it back to them and they'll lead you to a little treasure hunt... at the end of it, you can choose to keep the 50,000 yen or give them to their guardian, in return he'll give you a key you can sell for the same amount, so no reason to not to do it!
Also you get to name them, I went for Tora ("Tiger") for the striped one and Yuki ("Snow") for the white one, because I'm not very creative. :P

And since I bumped into another substory at 18:04, I figured I'd include it, a kid bumps into Saejima in the Underground Mall and swipes money from him, pursue him, pay a guy for info (Shame you can't beat him up) and find the kid in the Parking Lot, he'll then explain his story and you'll have to beat up some guys.

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