Akira Hoshino is the director of Tingarla Aquarium. An acquaintance of Kukuru Misakino's grandfather, he recommended Kukuru for a position at Tingarla after the closure of Gama Gama Aquarium. Hoshino possesses a cheerful personality, particularly noted following his return from Hawaii. On Gama Gama Aquarium's final day of operation, he personally extends a job offer to Kukuru, expressing his desire for her to join Tingarla and marking a pivotal career transition for her. His leadership style at Tingarla is supportive towards both staff and visitors, contributing to the aquarium's operational environment. The etymology of his surname "Hoshino" combines "star" (星) and "field" or "wilderness" (野), while his given name "Akira" means "clear" (晃).