Bronze: Zetsuai since 1989

Original summaries from Sadomina's Zetsuai page, since I suck at summarizing. I tried to shorten them a bit, anyway.
Note: I'm following the story with scanlations, so I didn't provide any sort of (to me) spoiler.

Volume #1

After raping Izumi, Koji avoids any contact to him trying to not hurting him anymore. But after receiving another love confession, Izumi asks Koji if he still wants to sleep with him, and they end out sharing a sweet night together.
When Koji wakes up the next morning Izumi has left behind him a note telling he's going to Italy for a week. Koji, fearing about losing him, follows him on his motorbike, but has an heavy accident. He lays on a deep coma and only a miracle could wake him up.
Takuto is informed about Koji's accident a week after at the airport returns: he stays at his bed praying he'd come back to him with no success.
His soccer managar reminds him to live is own life and, as he doesn't need Koji but only soccer, leaves his's bed.

Volume #2

Izumi is now concentrated only on soccer, and become friend with the new goalkeeper, Kunihide.
During his last visit to Koji's room, Koji awakes only to find he lost is voice. His brother Hirose takes the chance to take him back to home, to make him follow their father' last order: become Nandjo dojo's master. Koji agreeds, wanting to leave Izumi's side to not hurt him anymore.
Izumi, ends up beating up some guys who are about to publish a dirty story about how Koji's lost his voice: is just suffering for Koji's disappereance from his life.

Volume #3

Koji finds Izumi crying, and, since can't get back to the dojo because of the media, starts living at Izumi's place: slowly Izumi accepts Koji’s love.
Hirose and Akihito do everything to destroy Koji's life: Hirose drives the company of Izumi’s foster-father into bankruptcy and kidnaps Izumi: Koji begs his brother to take back his actions kneeling down in humility and driving Izumi mad because of this degradation. He just reminds him he always promised he would do everything for him and now he doesn’t even speak to him: this reaction helps Koji to get his voice back. He confesses his love and tells Hirose he leaves the family. Since he doesn't want to sing anymore, he will make the last album and final concert. At this one announces his leaving, and Eri (Kunihide's girlfriend) attacks him with a knife. The wounds aren't serious but Koji shall be looked after: Izumi decides this is his job, and he'll never let him go again.

Volume #4

After attacking Koji, hated by fans and surrounded by press, Eri's mental condition gets worse day by day. Kunihide, loving her so much, looks for revenge on Koji, who he blames for all. Hirose'll help Eri if he'll rape Izumi.
In the meanwhile Koji tries to do everything to make his lover happy.
In the meantime Izumi is now aware of his feelings towards Koji. On Christmas Eve he's going home to celebrate, but Kunihide invites him to his appartament -Koji's former own.
He drugs Izumi but, after talking about love, he let's him go. But it's too late.

Volume #5

We understand why Hirose hates Koji so much: he fought all his life to gain acknowledgment of their father, who however always preferred Koji.
He rapes Izumi for revenge and during so he tells him the truth about his parents: his father ad an affair with another woman.
Koji, worried about Izumi, calls Katsumi who tries to calm him down Koji uselessly. Immediately he starts look for him, and he found him sitting in front of his orphanage. Izumi tells him he has found another lover, but Koji finds the marks of the violence and understands. After being provoked, he proves Izumi his love through violence. He then drugs him to make him sleep to leave: Izumi, sleeping, reaches Koji's hair firmly, and Koji cuts them off.

Volume #6

Koji visits Hirose to put an end to their link. After hurting him, he cuts off his left arm: by doing so he seriously leaves the Nanjo traditions behind.
In the meantime Izumi notices Koji’s disappearance and lies to Katsumi when he calls him, telling that everything is fine and Koji still sleeps. Katsumi doesn't believe him and shows up at their home, just to find out Koji isn't there. At the same moment Koji appeares, apparently fine, and Katsumi leaves.
Izumi then sees what happened: at the first moment he's very furious but then understands: he also wants to cut every bond with the past and cuts his old hip's scat with a large knife.

Volume #7

Koji and Izumi's love is strong than before, and Koji's arm has been replaced with a prosthesis. Izumi gets seriously wounded at his knee during a game. He suffers from depressions fearing he will never be able to play again, but he has Koji near him.
Izumi goes back to Hirose and demands the return of Koji’s ring, which he carried at his lost hand, because his his. When Takuto gets it, he notices the engraved initial letters of the names of Koji and him.
Half of the volume contains bonus stories
about Kunihide and Eri, as well as Koji’s comeback with his new band "Kreuz".

Volume #8

After one month rehabilitation Izumi is able to play again under supervision. He now ever more on soccer like as is the most important thing to him: Koji even gets almost broken and jealous about this, he just fears Izumi is concentrating so much on his carrer to escape him.
After speding a day at the beach and a night in a hotel, Izumi becomes aware of his intensive feelings for Koji and becomes is really frightened.
Izumi is now popular with both fans and media, anche keeping their relationship secret it's indeed hard.

Volume #9

Although Izumi is happy, Koji is now almost crazy of jealousy because of soccer, even if Izumi told him he would never compare soccer to him., he still is jealous.
Izumi, now fully conscious of his feelings, tries to show Koji how much he cares him with small hints (like kisses, wearng his ring) but doesn't say it loud.
While he's at the training camp, Koji betrays him with some women again, and Izumi reacts extremely jealously.
Back at Nanjo's, Akihito is jealous of Hirose’s passion towards Takuto: he wants his brother for himself only.
At Christmas eve, when Izumi goes out to Tiffany’s to fetch his valuable gift for Koji (an expensive crucifix pendant), Akihito rides over him with his Porsche.