What is the Spirit Wave Orb?: YuYu Hakusho is a Japanese action-fantasy adventure television series developed by Akira Morii and Kazutaka Sakamoto for Netflix. It is a live-action adaptation of the 1990-94 manga series by Yoshihiro Togashi.
In the first season, Sakyo plans to use a large hole in Japan to bring yokai from the underworld into the human world. He has already succeeded, causing the premature death of Yusuke Urameshi. Sakyo also invites billionaires to bet on yokai fights.
The Spirit Wave Orb is a powerful technique developed by Genkai in the Yu Yu Hakusho series, later taught to Yusuke Urameshi. Yusuke first used the technique in the Dark Tournament, believing it was the only way to win against Jin. In the Japanese anime series, Yusuke tries to use the Spirit Wave against Shinobu Sensui but is kicked out of range before successfully using it. The technique is a key element in the series.
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In this show, we see that Genkai who is a former friend of Toguro and is discovers that the Spirit Wave Orb is a magical artifact and is no longer in her possession. Toguro kills her but later realizes that Yusuke has it. Toguro enjoys fierce fights and wants Yusuke to wield the Orb’s power.
Using that, Toguro tried to kill Kuwabara to unleash Yusuke’s ultimate power, but Yusuke’s spirit gun was too much for him. The Yokai acknowledges Yusuke’s strength before turning to ash. Koenma reveals that Toguro and his elder brother turned into Yokai to grow stronger after witnessing the deaths of their loved ones at the hands of a Yokai.
After that, we see that Yusuke saves a boy from a car accident but ends up dying himself. He is taken to Koenma, the son of the king of hell, who assigns him the role of a spirit detective to protect the human realm from Yokai. Toguro, a fan of fierce fights, finds Yusuke’s ability to endure fights entertaining.
Toguro tries to unleash Yusuke’s ultimate power by killing Kuwabara, but Yusuke’s spirit gun is too much for him to handle.