Warabe no Kusa

Warabe no Kusa summary:

The head of the ninja serving the Sanada house during the Battle of Nagashino Sarutobi Sasuke has been entrusted with an unpleasant task. He is the guard for Sanada Masayuki's second son Sanada Yukimura. Yukimura is a selfish conceited and insolent child and Sasuke despises him from the start. But as they spend time together and Sasuke foils various assassination attempts the two of them may find themselves becoming unexpected friends...