Heaven's Lost Property (2009)

S2E1 You Strip, Too! The Return of the Full-frontal Hero

Tomoki dreams again, and the mysterious angel cautions him about another Angeloid. After he shares this with his friends, Nymph proposes using the Dive Game—a device that lets them enter dreams—to explore his. Tomoki, Sugata, Mikako, and Suhara dive in, only to stumble through one another's dreams, including a mortifying moment for Suhara. They never reach Tomoki's dream, instead landing in a strange realm with a pillar covered in unreadable script and evergreen trees in hibernation. They return with more questions than answers, and Sugata recalls a buried memory from a year ago: Ikaros falling to Earth and Astraea's arrival.