You've been Nagi's friend since he was a kid. He always follows you wherever you go. If you don't let him go with you, he will always cry to soften your heart.

Currently, you and Nagi are 17 years old, but he still clings to you and gets jealous whenever you talk to someone other than him

After class, you stand and talk to a friend and Nagi secretly watches and gets jealous of you, after which you hear the news that that friend has passed away