No, there isn't a manga about what happens next to Sanosuke. Here is what happens:
*SPOILER ALERT!!!*
In the manga, Sanosuke travels overseas. He beat 200 men of the former Ishin shishi, the target in the Kurogasa (Jin-eh Udou ) arc. He soon fled out of Japan, almost right after Megumi did. In the second to the last chapter of Rurouni Kenshin, he sent a letter to Kenshin and the others, saying that he was currently in Mongolia and was doing well. It was never shown that he returned to Japan, although in the OVA Kenshin was found in presumably China, where Sanosuke helped him get back to Kaoru in Japan. He was never seen returning to Japan in the OVA either.
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In the manga, Sanosuke travels overseas. He beat 200 men of the former Ishin shishi, the target in the Kurogasa (Jin-eh Udou ) arc. He soon fled out of Japan, almost right after Megumi did. In the second to the last chapter of Rurouni Kenshin, he sent a letter to Kenshin and the others, saying that he was currently in Mongolia and was doing well. It was never shown that he returned to Japan, although in the OVA Kenshin was found in presumably China, where Sanosuke helped him get back to Kaoru in Japan. He was never seen returning to Japan in the OVA either.
No, they aren't going to make a season 2 of Rurouni Kenshin. If you want to find out what happens next, read the manga. All of Kenshin's history and a little bit of his future is in there. Watch the OVAs if you want to know all of what happens to Kenshin.
Rurouni Kenshin is an amazing(In my opinion) manga that is about a rurouni (wanderer) named Himura Kenshin who was once a hitokiri (assassin) called Battosai who killed many to start the Meiji Era. Now he carries a reversed edge sword (sakabato) to prevent him from killing. He soon meets a young girl, Kamiya Kaoru who owns a dojo. Along the way he befriends people like Sagara Sanosuke and Myojin Yahiko. Kenshin encounters many foes from his past and the present and fights to protect the present. READ IT!!
'Oro' doesn't mean anything. It displays a sense of confusion.
Kenshin died from lepresy. Also, Kenshin had passed this disease to Kaoru through sexual intercourse. ^^ That's not canon, that happened only in the second OVA (Reflection). In the manga, Kenshin does not die. His Hiten Mitsurugi Ryuu becomes ineffective due to the strain it has exerted on his body so he can't use it anymore. He retires and lives happily ever after with Kaoru. Ohh and I don't think that was supposed leprosy. Different people have different theories on what the disease was but it may very well not be a real disease. It's something he got from using his swordsmanship too much.