Ringcode is T-19717M-0855 1MM1 and barcode is 4933516-20617-7.
What looks interesting in this disc (at least for Japanese people or anyone else able to understand what's going on!) is that there is a downloads section, which appears to contain save files for many other KID games. I did a little Google translating and it appears that some are to unlock stuff (presumably art and the like) while some others that are large files (80-90 blocks) look like new scenarios. You could call them DLC nowadays and you would have to pay for them.
Just a heads up...
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Listing of cdrom
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CD-ROM INFO
Title BOKU TO BOKURA NO NATU
Media ID EEDE
Media Config GD-ROM1/1
Regions J
Peripheral String 0799A10
Product Number T19717M
Version V1.001
Release Date 20020724
Manufacturer ID SEGA LC-T-197
TOC DISC
Track Start Sector End Sector Track Size
{track01.bin} 150 762 1441776
{track02.raw} 913 12265 26702256
{track03.bin} 45150 549299 1185760800
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3
1 0 4 2352 track01.bin 0
2 763 0 2352 track02.raw 0
3 45000 4 2352 track03.bin 0
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rom ( name "Boku to Bokura no Natsu v1.001 (2002)(KID)(JP)[!].gdi" size 87 crc 95fe57f8 md5 412dfae214afa4b99348a18ca0e7fb99 sha1 be2d790660e23af5060a56583346453a97ebdbee )
rom ( name track01.bin size 1441776 crc 7f44105f md5 5b7d07ee4e06e33dfc112a39ad7ece83 sha1 b097631ba72e959b73ad0664aea89202d343d1d1 )
rom ( name track02.raw size 26702256 crc 3b5b1afa md5 2d0cfcc22a980d66e57e57744389402f sha1 63c86967189c2920b7a6d186cae478ef37d50b62 )
rom ( name track03.bin size 1185760800 crc 09652baf md5 2ce1526b6580d03afc6ca1add9baf7d6 sha1 5a77740b66a32013cf492f47647b48a72654ea22 )