2.5 stars, not my jam but fans of the paranormal/superpower school/training camp trope (like My Hero Academia, Blue Exorcist, Chainsaw Man, and to some degree Kimetsu no Yaiba) might enjoy this entry in that subgenre.
Delinquent teen Shiki didn't realize his adoptive dad used to be an Oni-hunter from a group of descendants of the legendary Momotarou, or that he left the organization to raise Shiki...who has Oni blood! But when his dad is killed protecting him from a Momotarou assassin, Shiki's oni blood awakens, and he swears to get revenge. Except he can't control his powers yet, and the Oni fighter who finds him doesn't much care for his undisciplined attitude. To get his revenge, Shiki will have to learn how to control his powers enough not to get expelled from Oni training school.
In this story, Oni blood takes whatever shape its wielder commands, whether that's a sword, spear, buzz-saw (hello, Chainsaw Man ;P) or even fancier things like umbrellas or guns. Since you have to bleed to use it, be warned: there is self-cutting! And some characters are flashy about it o_O
The characters are pretty standard for the sub-genre: the reckless hothead protagonist, the fastidious overpowered teacher, the more self-possessed yet somehow more unhinged rival, the timid classmate. It's also a very standard plot: discovering unexpected powers and having to master them, and seeking revenge for a dead family member. Nothing you haven't seen before in other superpower-school shounen manga, so nothing really stood out to catch my interest.
But, like I said, if that's your comfort-read trope, you'll probably enjoy this more than I did!
Content concerns: murder, death of a parent, bloody violence, habitual self-harm (cutting) due to the nature of the blood-powers, body-horror (related to the self-cutting); no nudity/sex, alcohol, or drugs (not yet, anyway), no habitual/gratuitous swearing