KIZUNA

Ranmaru and Kei have a strong and passionate relationship built on years of trust, sacrifice and love. But when the mysterious son of a Yakuza boss begins to pursue Ranmaru's affection, tempers flare, and hidden emotions rise to the surface. Will Ranmaru and Kei's love survive, or will the emotional conflict finally come to a head? (Source: Be Beautiful) — Description from AniList community (anilist.co).