After her parents remarry, Matsuri suddenly becomes the sister of her idol crushes—Terzetto’s three brothers. But her dream life turns chaotic when she discovers they can’t stand each other! Determined to fix things, she plans a “welcome party” that doesn’t go as expected.

During a Terzetto concert, a blackout hits—but Matsuri’s quick thinking unites the crowd. That same night, Azusa confesses his feelings, and her childhood friend Subaru reappears, sparking a storm of romantic tension.

Matsuri and Azusa’s first date at the amusement park takes a sweet turn—until a secret from his past deepens her feelings. But behind the scenes, Yamato makes a dangerous move that could change everything.

With PRISM’s success threatening Terzetto, tensions rise. Matsuri nurses a sick Subaru, leading to an unexpected confession. But things get awkward when she runs into Azusa—at a hot spring!

At the school sports festival, the winner gets a private day with Terzetto! But jealousy brews, and Matsuri ends up locked in a storage room—with PRISM’s Yamato. Trouble—and unexpected sparks—follow.

After the tournament, Azusa distances himself. With Terzetto set for a rematch against PRISM, tensions soar at training camp—especially when Azusa catches Matsuri in a compromising moment with Yamato.

A tabloid scandal explodes, dragging Matsuri into the chaos. Confined indoors, she faces Azusa’s pointed question about her true feelings. But a dangerous encounter at a nightclub puts her in real peril.

When Azusa’s injury forces Terzetto to withdraw, support from friends reignites their spirit. As Terzetto and PRISM face off in a grand showdown, every love story reaches its fateful finale.