this is why tomoko and mako should not be a couple. Mako is almost as popular as tomoko so if you take them both off the market:
Hina - Akane? (no tomoko)
Yuri - ? Hina? (no mako and no tomoko and akane has first pick of hina)
Masaki - ? (her gfs are probably paired up) (no mako and no tomoko)
Emily - ? no tomoko
Asuka - Fuuka? (no mako and no tomoko)
shizuka and yuu - have to go back to boys - BAD END
etc.
Actually, looking at this, both Tomoko and Mako should have multiple GFs