I wanted to make a list of the character relationships we have so far, but only the characters that have shown up for more than one arc, or for long period of time. So even though Ren is loved by thousands of women, most aren't really relevant to the manga.
--> arrows pointing this way means this person loves the bolded character
<-- arrows pointing this way means the bolded character loves this person
Let me know what you think and if I missed anyone important. Also, if you have a better way of displaying it, I would be happy to edit this.
Kyoko Mogami
Mutual love:
Tsuruga Ren <-->
One sided love:
Fuwa Shou -->
Leader of Bridge Rock -->
Reino -->
Other:
Kijima (wants to date her, but doesn't love her)
Tsuruga Ren
Mutual love:
Kyoko <-->
One sided love:
Momose ? -->
Maria -->
Other:
Yashiro
Fuwa Shou
Mutual love:
none
One sided love:
Kyoko <--
Nanokura Mimori -->
Other:
Shoko (don't seem to love each other romantically, but sexual relationship)