Ep. 89: Ataru stays home with Lum while his parents travel to Atami for the night.
Aired on November 9, 1983

Ataru's parents depart for an overnight trip to Atami, leaving Lum and Ataru alone in the house. Ataru fears a dinner prepared by Lum, while Mendo and Lum's Stormtroopers invade the Moroboshi residence to protect her from him. Ataru attempts to kiss Lum at the final moment, but as a precaution, he wears armor that prevents electricity. In the last frames, he begins to cry.
Episodes
- Ep. 85 · Lum, Ran, Benten, and Oyuki discover former teacher CAO-2 has returned to Earth
- Ep. 86 · Outraged! Piteous Kid Shutaro!!
- Ep. 87 · Tomobiki High Students Become Eccentric After Eating Matsutake Mushrooms from Cherry
- Ep. 88 · Ataru delays apologizing to Lum after burning her handmade scarf for him
- Ep. 89 · Ataru stays home with Lum while his parents travel to Atami for the night.
- Ep. 90 · Onsen-Mark tasked with transforming Ryuunosuke into a woman
- Ep. 91 · Tomobiki Holds a Contest to Crown the New Miss Tomobiki
- Ep. 92 · Ataru experiences an out-of-body episode after consuming Cherry's fish-shaped potion
- Ep. 93 · Shutaro discusses Ataru's potential weaknesses with Sakuranbo in this clip show