File 945+

It's a YumixShukichi case. Apparently the story is about "That famed envelope with the marriage registration on it".
Fun info on the file cover: "Cover image: A marriage registration with only Kudo Shinichi's name written on it behind Conan"
Full spoiler summary by Spimer http://forums.dctp.ws/viewtopic.php?f=5&t=13030#p862133

. Yumi and Naeko off-duty day. On street TV article it says Shuukichi is going to face the last battle to defend the 7 crowns
. Yumi realizes she hadn't thought of Shuukichi like that, realizes the meaning of "once I've got the 7" and recalls that the envolope was used by her as
a bookmark in a fashion magazine which she threw
. They go to the garbage spot but it's already been collected: knowing Shuukichi's personality she can't possibly ask for him to write it again
. DBs show up: Conan says that today doesn't seem to be recyclable waste day so maybe the manager's sorted it out
. They go to Yumi's house and find a bundle of magazines that have been returned: they go over them but they can't find the envelope
. Mitsuhiko asks what she's looking for and she rather replies in a rather threatening manner "100 million Yen!"
. Since Yumi had said "some kind of important envelope" then Haibara says "That famed envelope with the marriage registration on it": it looks Yumi's the only one who hasn't noticed what the envelope is about
. Yumi goes to speak with the manager who doesn't seem to call her "Chacha" because he likes it
. "I'm sure you're an evil woman who'll water down the Taiko (Meijin)!"
. Back when Shuukichi was a middle-school student, the manager tried to challenge him to defeat him but he got defeated instead
. Afterwards he became a fan and encouraged Shuukichi
. He took a photo of what was inside the envolope with his smartphone because he assumed Yumi wouldn't care: it was in the garbage, after all
. Shuukichi's now at 3 wins 3 loses: a reply to his engagement hasn't come yet and his morale doesn't increase or they get told
. Shuukichi's currently annoyed at Yumi
. Turns out the manager set up an unkind trap by constantly saying "If what Yumi thinks of you is true then she has to show it to you" to Shuukichi.
. Conan turns out the manager's PC he gets asked a password and can only get wrong 1 time
. So they (maybe he and the DBs?) begin to rummage the room...
Side-note: Genta's found a paper with something written on it: some kind of code?
To be continued in Issue #8