This page deals with Kasegi's interactions with the other characters.
Humans
Ren Kunanzuki
Kasegi purchased the hosting rights of Rachnera from Ren Kunanzuki's parents after Ren was injured accidentally by Rachnera.
Kimihito Kurusu
Kasegi barged into the Kurusu house without the young man's permission do some documentary that was a front to something else. A humanoid slime blew Kasegi's cover provoked the young man to attack him.
Kuroko Smith
Kurusu Household Guests
Miia
Papi
Centorea Shianus
Suu
Meroune Lorelei
Rachnera Arachnera
After Kasegi purchased the arachne from a family, he exploited her as a money-making tree by selling her silk. Eventually, Kasegi was tied up by her as she had had enough living with him.