Hoping to clear the field for An's affections, Ail sends a Cardian to drain Mamoru, only for the monster to bolt without obeying. Stuck in detention beside a weakening Natsumi, Usagi becomes the easier prey when the alien's hunger turns on her instead.
Usagi arrives late yet again, but Ms. Haruna is too giddy over a date to care, until a cancellation call sours her mood and earns Usagi detention for snacking in class. Natsumi lands the same punishment after answering a translation in her native alien tongue, and the two are set to grinding through English exercises. Once Haruna learns the date is back on and leaves, the rivals decide that whoever finishes first has a claim on Mamoru.
Meanwhile Ail summons the Cardian Amanju and, spotting Mamoru on the street, orders it to drain him so no one competes for An's heart. The monster ignores the command and leaps away without touching Mamoru, leaving the plan in ruins.
Growing faint from lack of energy, Natsumi drains Usagi to sustain herself. Luna warns Usagi of the danger, and she becomes Sailor Moon to face Amanju, though at first she is too depleted to fight back. Encouraged by the Moonlight Knight to trust that the strength is still within her, she rallies and destroys the Cardian with Moon Princess Halation.
Back in detention and restored to their ordinary selves, Usagi and Natsumi complete their assignment at the exact same instant. The two settle their contest by agreeing that the choice between them rightly belongs to Mamoru. Far off inside the Makaiju's dimension, the tree's light flickers with worrying instability.
The eleventh episode of the second season aired in Japan on June 5, 1993, and reached North America as "Detention Doldrums" on December 6, 1995, written by Katsuyuki Sumizawa and directed by Yuji Endo. It stands as the only episode to feature two Cardians, since an unnamed one is destroyed almost immediately at the opening.
Several dub alterations changed the detention assignment and renamed Haruna's boyfriend, while the early scene with the mysterious Cardian was dropped from the DiC, French, and Hungarian versions. The episode also offers the first look at Sailor Guardians other than Minako running late to school, and notes that Ami claims a spotless punctuality record up to this point.

Naruto vs Luffy with the twist nobody asked for: Luffy tickled Hinata on date night, and she kind of liked it. We break down the whole fight and commit to a winner....

There are no women on Namek. That isn't an oversight, it's the biology. Why we handed Piccolo the one thing his own species rules out, and why it had to be trap soul....
In "After-School Trouble: Usagi is a Target," Ail orders the Cardian Amanju to drain Mamoru's energy so no one competes for An's affections, but the monster ignores him and bolts without touching Mamoru.
During detention, Usagi's rival Natsumi grows faint from lack of energy and drains Usagi to sustain herself, prompting Luna to warn Usagi of the danger.
Sailor Moon is at first too depleted to fight back, but the Moonlight Knight encourages her to trust her remaining strength, and she rallies to destroy Amanju with Moon Princess Halation.
Usagi and Natsumi finish their detention assignment at the exact same instant and settle their contest by agreeing that the choice between them rightly belongs to Mamoru.
"After-School Trouble: Usagi is a Target" is the only episode to feature two Cardians, since an unnamed one is destroyed almost immediately at the opening before Amanju appears.
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