​In this captivating episode based on Kino Hitoshi’s original work, meet Arisa and Mika Nanase, the alluring sisters who reign as the super-idols of their school. Amongst the boys who can only admire them from a distance is Sousuke, an ordinary student longing to connect with Arisa. However, a surprising twist of fate awaits as Mika approaches Sousuke after school and delivers shocking news – they are now siblings! Unveiling the truth behind their newfound siblinghood, Sousuke’s adventurer father and the Nanase sisters’ archeologist mother fell in love in South America. As they adjust to their new living arrangements, Sousuke must navigate the challenges of avoiding inappropriate situations with Mika and Arisa. Tune in for steamy moments like bathtime with Mika, showcasing the intimate bond shared by siblings. Whether they lend a helping hand or more, this enticing tale explores the tantalizing dynamics of their unconventional family relationship.​