Tomodachi 100-nin Kireru kana

They're surely all around you, dominance-asserting friends, greedy friends, social network-dependant friends... toxic friends who you surely thought you were close with in the beginning, but are now just trouble to deal with. "Being with them is a pain but I have to stay friends with them, and having more friends is better..." Human researcher Ado Arima will teach you how to free yourself from such a curse!

(Source: Shinchosha, translated)