The second part, corresponding to the second season of the anime Mushoku Tensei: Jobless Reincarnation , premiered on April 7th, and the official website released the anime's opening sequence without credits.
Therefore, the opening theme song for Mushoku Tensei is called "On the Frontline" by the band Hitrie.
Mushoku Tensei Synopsis:
The plot revolves around a 34-year-old man who is unemployed and has no prospects. To make matters worse, he is hit by a truck. Soon, he is reincarnated in a fantasy world full of witchcraft in the body of a baby. But, over time, he develops great magical abilities. However, he resolves to succeed in his new life, discarding his past identity for his new life as Rudeus Greyrat.
Part 2 of the first season of the Mushoku Tensei: Jobless Reincarnation anime premiered in October 2021 in Japan, followed by Part 1 of the second season which premiered on July 2, 2023.
Source: Official Website