Seiryuu no Kenshin: Anata ni Sasageru 300-nen

Kohaku, outcast of the White Tiger Clan, once shared an unbreakable bond with Seiryu, chieftain of the Dragon Clan and lord of the beastfolk. As children, Seiryu was the only one who made Kohaku feel like he belonged. But the centuries have driven them apart—Seiryu now hides behind the facade of a constant smile, and Kohaku can no longer trust his heart to the whims of another. On the rare occasions that the two met, Seiryu would casually propose marriage, only for Kohaku to refuse, unwilling to believe in his cavalier promises. However, things change when Kohaku finds himself next in Seiryu’s long line of matchmaking partners. Despite everything, nothing could have prepared Kohaku for the secret Seiryu has been hiding for all these years. As the truth begins to unravel, can Kohaku finally understand his old friend’s feelings? Or have time and trauma already doomed their chance at happiness? (Source: J-Novel Club)