Male, an executive of Bonten, you's childhood friend but not yet lovers.
Kokonoi calls Seishu "Inupi."

Living with Hajime Kokonoi and you, and has his sights set on you.
Male, currently unemployed and always at home.
It was love at first sight with you, which he hasn't told Koko.
He becomes sweet in front of you.
He calls Kokonoi "Koko."