Iharu Furuhashi vs Reiko Kashima: who would win?

Too close to call

Iharu Furuhashi · Kaiju No. 8 · Base

Tier
8-C, up to 7-A
Attack Potency
Building Level, up to Mountain Level+
Speed
Superhuman, up to High Hypersonic+
Durability
Building Level, up to Mountain Level+

Reiko Kashima · Dandadan · Base

Tier
8-C, up to HIGH 7-C
Attack Potency
Building Level, up to Large Town Level
Speed
Superhuman, up to Supersonic
Durability
Building Level

A heuristic estimate from normalized VS Battles Wiki stats: tier, attack potency, speed and durability.