In a realm where demi-beasts and humans coexist, Riku Kurobuchi, a charming panther demi-beast known for his athletic prowess and popularity, grapples with an unusual situation. Despite his social success, he has yet to undergo his anticipated 'heat' unlike his peers. When he unexpectedly becomes roommates with the mature and striking albino lion demi-beast, Touma Shishigaya, Riku strives to conceal his predicament from the assertive Touma. However, it is Touma's captivating pheromones that trigger Riku's first heat, sparking a tale of desire between a stunning albino and an inexperienced demi-beast.