https://www.doujinshi.org/book/148772/Kage-no-Nan-Demo-R/
https://www.suruga-ya.jp/product/detail/ZHOA1435

Oh man I miss bunchindoh when i see these kinds...

Base +7, fullereno +2

since 1996?!

Base +6, fullereno +2

3-15 Tenchi. I am not sure if any of the girls meet presence for tagging...

50-89 Rei x Shinji, NGE

Base +55, 58569 +6

an unprecedented 40 pages of ryu & sakura vanilla?! this is unheard of by today's doujinshi (it's always someone other than ryu banging sakura these days)!

Base +6, brackwristedfisshu +6, IsaruBoy +6, titoloco -7

001 Evangelion
003-012 Tenchi Muyo
013-015 Gundam X
017-030 Original
031-032 Lamune & 40 Fire
033-048 Tokimeki Memorial
050-089 Evangelion
092-101 Original
102-112 Real Bout Garou Densetsu (not that it looks different from any KOF)
113-122 KOF
123 Street Fighter Zero 2
124-148 Virtua Fighter (anime version)
152-158 Dragon Force
159 Street Fighter Zero 2
160-172 Virtua Fighter 2
176-215 Street Fighter Zero 2
221-242 Vampire Hunter
243-252 Street Fighter Zero 2
253-268 Crayon Shin-chan

Base +58, Zeros_18 +6, dirtyhairry +18, fullereno +2, chainsolution +6

102 is Spiral. A Marvel comics character. Probably because of X-Cota given the time frame.

Base +6, dirtyhairry +18, meranon +6

184-213 damn!!!! sakura and ryu got a hell out of a sex night, pretty obvius that sakura will get pregnant from all those hado-cums

Base +6

One of the things I like about this circle is that they list most of the characters and series they're from at the end

Base +10