Fault!!

Amidst the scorching summer months, Sugiyama and his tennis team comrades embarked on a distant training expedition. Unbeknownst to them, their secluded journey was about to take an unexpected turn. As they honed their skills on the court, Sugiyama's enigmatic step-sister Mio subtly introduced her own unique training regimen. Meanwhile, Saeki, Sugiyama's doubles partner, found herself captivated by a hidden agenda after witnessing their sessions. What initially began as a routine tennis retreat soon transformed into an unforgettable adventure laced with intrigue and desire.