|Voice Actor||Satoshi Tsuruoka|
- Heath Oslo was the main antagonist of the second and third visual novels. He was an international terrorist who took in Yuuji after the death of his parents. As a professional terrorist, it was almost impossible to track him down. He apparently ran businesses all around the globe. He possessed multiple fraud identities in America alone, all with their own SSN and pay his taxes without fail. His true age and nationality is unknown, and the photograph obtained by CIRS of him is shown to have different facial and physical features. Eventually, his name is used as a reference to an organisation rather than an individual.
Plot (Visual Novel) Edit
Grisaia no Kajitsu Edit
He does not appear in Grisaia no Kajitsu. However, his influence on Yuuji's life can be identified on several occasions.
Grisaia no Meikyuu Edit
Heath Oslo plays a big role in Yuuji's tragic past.
The Cocoon of Caprice Edit
He first introduces himself as Kirihara Rei to Ryouji Kazami during one of their meetings to discuss an artwork that Kazuki made. When Yuuji came home, he took interest in the boy and gave him a piece of chocolate. He often interacted with Yuuji when he was a child whenever he visited the Kazami household.
After the death of Yuuji's parents, Oslo took the boy in as an adoptive parent. He usually dressed the boy in girl costumes and sat him on his lap for his entertainment. However, after he witnessed Yuuji brutally kill a man in his mansion, he began to see Yuuji's potential as a killer. Hence, he enrolled Yuuji in one of his "schools" specifically design to train child terrorists. He regarded Yuuji as special, and often visited him for a private lesson in knife combat despite his work.
He was also at Yuuji's "graduation ceremony", where Yuuji was pitted against a girl in a life-or-death combat in which the one who survived gets to graduated. Initially pleased with Yuuji's performance, he became irritated after Yuuji hesitated and stopped trying completely. After Yuuji recovered from the injury, Oslo assigned the boy on an assassination mission, not wanting to give up hope on Yuuji's potential. He was shown to be pleased when informed of his success, noting that a slightly problematic child is a part of what makes them cute.
- His first appearance in the anime is at the end of the last episode of Grisaia no Kajitsu (Anime). Though his first visual novel appearance was at the beginning of Grisaia no Meikyuu.
- Heath Oslo was the one who trained Kazami Yuuji to be a successful Assassin.
- In the visual novel, he is just a clone of the real one, but that was changed in the anime.