Iroha Tsuchiura

Iroha is Shūsuke's childhood friend from before Nao's adoption. She claims to be Shūsuke's lover and constantly makes advances towards him. She is also something of a stalker, watching him in his house through a telescope and using night vision goggles to stalk him. She is even called a "Genuine Stalker" due to her very detailed reports of Shūsuke's late night actions and activities. She is in constant competition with Nao over Shūsuke's affections, though they occasionally work together when someone else catches his eye.