Kasuga Osamu has opened an establishment adjoining his lab for patrons to engage in the challenging sport of throwing weapons. Regular tournaments are offered with prizes encouraging of those from the lower classes to participate.
Those who are particularly skilled and seem to have the appropriate character are brought in for additional training in his specific school of utilizing improvised thrown objects along with a number of other useful skills.
In addition to the named and more dedicated students there are another 3 former students of Sho running his shop and largely being trained there.