Triangle Blue - Season 1

Based on the erotic game by LiLiM DARKNESS. The longstanding companionship between Asato and Akane has not progressed beyond a platonic stage. Despite this, Asato believed their contentment would endure indefinitely. This expectation is disrupted by the arrival of Kyousuke, a childhood friend of Akane's. Kyousuke approaches the couple with a request to stay with them for a brief period. Out of a desire to assist her friend, Akane persuades Asato to agree to the arrangement. Neither individual foresees the hidden motives driving Kyousuke's actions.