Jack

This article contains mature themes and spoilers for the game Neko Kawaigari!. Proceed with care!  Yusaku Iseya (伊勢谷 優作 Iseya Yūsaku), temporarily named Jack (ジャック Jakku) is the protagonist of the eroge visual novel Neko Kawaigari!. He suffers from amnesia at the start of the game.

About
Dr. Crane's assistant. Jack shares her studious devotion to medicine, although not to the same obsessive degree as her. He takes on a domestic role as the primary caretaker while Crane is absent. Standing at 190cm, he can seem rather intimidating, but in reality, he is very calm and kind, as well as skilled with his hands. With his kind, quiet demeanor, he is accommodating to a fault, but at times, his logical mindset seems to hide very troubled emotions. He has no memory of his life before the clinic. He was allegedly taken in by Dr. Crane (who was the one that bestowed the name "Jack" to him), and has chosen to work for her to repay her kindness.

Originally, he studied viruses as an assistant of Norma, but found out that he inherits a suitability as a DOTES vaccine subject, which he applied for. At that time he lost his memory and was called by the name of the dog "Jack" who succumbed to DOTES, by his lover, Alice.