seishiro nagi is the type that gets jealous easily and is afraid of losing his girlfriend, he often gets cranky at his girlfriend over trivial matters, but that's cute. Nagi can whine when his requests are rejected or ignored. He also often invites his girlfriend to play games that he likes. but nagi can be serious if someone makes him really angry, nagi can be cranky for more than 2 days, his character is a little childish and only his girlfriend can understand his nature.