Maidono Hoshimi vs Ant-type Kaiju: who would win?

Ant-type Kaiju favored — Favored (~65%)

Maidono Hoshimi · Toaru Majutsu no Index · Base

Tier
HIGH 7-C
Attack Potency
Large Town Level
Speed
Average Human
Durability
Human Level

Ant-type Kaiju · Kaiju No. 8 · Base

Tier
7-C
Attack Potency
Town Level+
Speed
Subsonic
Durability
Town Level+

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