Endou's GF, Inamori Kako (might be missing some earlier chapters)
260, 284, 286, 287, 340, 611, 612, 613, 614, 616.9, 629, 643, 644, 679, 712, 713, 714, 729, 733, 740, 741, 742, 745, 752.1, 753, 785, 821, 825, 870, 873, 911, 954, 1008, 1085,
Old book (G)friend Natori (might be missing a couple) 3, 1017, 1018.1, 1018.2, 1085(?),
There were a couple chapters where Togawa could've found out about Inamori knowing Mamoru after she had known/met him (those being 745, 752.1 and 785, I think), but I can't help but feel there is another one I am forgetting. Maybe in one of the Togawa chapters, and I didn't mark it (doesn't help I don't have the list for Togawa).
Also, real nice that she felt strongly for Togawa there at the end, Inamori is nice. Always a bit bummed at how infrequent her chapters are/can be.