You're the Hundred Kmph Granny

Out of options against the swarm of possessed people, Okarun shifts into his Turbo Granny form and scoops up Momo to barrel through the mob. The brutal speed wracks them both, and in the chaos Momo loses her grip on the Turbo Granny presence within Okarun. The freed spirit kicks the two away, knocking Okarun unconscious, then merges with the Earthbound Spirit Crab and braces for a game of cat and mouse with Momo. Turbo Granny offers her a few minutes' head start, but Momo retorts that one second is all she needs and uses her psychic powers to latch onto a passing train.

Confident her quarry cannot slip away, Turbo Granny pursues, only to discover she has been lured. Momo reveals that her grandmother Seiko had rigged a trap along the rail line running toward Kamigoe City. Holding the spirit fast with her powers so it cannot flee, Momo defeats the Turbo Granny-fused crab the instant they reach the snare.

Okarun carries Momo through the possessed crowd in his Turbo Granny form, but the strain causes Momo to release the spirit, which then bonds with the Earthbound Spirit Crab.

Momo baits the merged creature into following her train ride straight into Seiko's prepared exorcism trap on the railway, where she pins and defeats it.

This early chapter is part of the Turbo Granny Arc within the Kintama Hunt Saga and showcases Seiko's exorcism setup. It appears in Volume 2 and was adapted into anime Episode 4.