One cited fightMob Psycho 100 · vol. 5, ch. 38
Does this result move the ranking?

Confirms the ladder

The higher-ranked entity beat the lower-ranked one. Record and ladder agree.

Shigeo Kageyama vs Megumu Koyama

The winnerShigeo KageyamaMob Psycho 100 · rank 1
11 places
BeatenMegumu KoyamaMob Psycho 100 · rank 12

The second meeting of a pair whose first one Koyama got out of, and this time there was nowhere to get out to. That first fight stays out of the records because it ended on a cursed perfume and a kidnapping rather than a result; this is the answer to it. The order is confirmed by a wide margin. What separated the two meetings was not Mob's strength or his willingness, since he had gone to 100% the first time too, but that this time there was no perfume and no hostage to run with.

The connecting record

shownMob Psycho 100 · vol. 5, ch. 38

Shigeo Kageyama beat Megumu Koyama in Mob Psycho 100.

What each of them is ranked on

The winner · Shigeo Kageyama · rank 1

Mob

Mangacomicanimation

Choked unconscious by Teru, he broke Teru's barrier and lifted the wreck of Black Vinegar Middle School above the clouds; awake again at 100% Sadness, he put the building back. Inside Mogami's mindscape, with his mental body destroyed, he erased the spirit army and the world it lived in. Hit by a car on his way to confess to Tsubomi, he walked across Seasoning City as a storm while Teru, Sho and Toichiro Suzuki tried to stop him, absorbed the blast father and son fired together, and arrived to be turned down.

  • shownMob Psycho 100 · vol. 1, ch. 8

    At 100% Rage, slices off all of Dimple's limbs and exorcises him with a tap to the forehead.

  • shownMob Psycho 100 · vol. 3, ch. 18

    Unconscious at ???%, breaks Teru's barrier and lifts the school's rubble into the sky.

  • shownMob Psycho 100 · vol. 3, ch. 18

    At 100% Sadness, reassembles Black Vinegar Middle School.

All 10 citations
  • shownMob Psycho 100 · vol. 9, ch. 67

    At ???%, absorbs Mogami's spirits and destroys the mental world, freeing Minori.

  • shownMob Psycho 100 · vol. 12, ch. 90

    Lifts the Seasoning City Culture Tower into the sky to fight Toichiro away from the others.

  • shownMob Psycho 100 · vol. 12, ch. 90

    Draws Toichiro's overloaded energy into himself inside a barrier and survives the explosion.

  • shownMob Psycho 100 · vol. 14, ch. 97

    At 100%, spends the rest of his power in one blast, then walks to Dimple to talk.

  • shownMob Psycho 100 · vol. 16, ch. 100

    At ???%, overwhelms Toichiro and absorbs the Charge Bomb he and Sho fire together.

  • shownMob Psycho 100 · vol. 16, ch. 100

    Tsubomi turns down his confession.

  • shownMob Psycho 100 (anime) · S01E05

    Teru and the rubble of the school are carried above the clouds.

Shigeo Kageyama on the Mob Psycho 100 ladder

Beaten · Megumu Koyama · rank 12

Scar of the 7th Division

Mangacomicanimation

Broke Mob's barrier in an alley and beat him and Ritsu badly; it pushed Mob to 100% Hostility, and then Koyama's best attack did him little harm. He got away with Ritsu by putting Mob to sleep with Sakurai's cursed perfume. When they met again inside the 7th Division's base, Mob beat him without a contest.

  • shownMob Psycho 100 · vol. 4, ch. 32

    Breaks Mob's barrier, and Mob reaches 100% Hostility.

  • shownMob Psycho 100 · vol. 4, ch. 33

    Sprays Mob with a cursed perfume that knocks him out, and escapes with Ritsu.

  • shownMob Psycho 100 · vol. 5, ch. 38

    Is defeated by Mob in a one-sided fight.

All 4 citations
  • shownMob Psycho 100 (anime) · S01E08

    His Energy Bomb has little effect on 100% Mob.

Megumu Koyama on the Mob Psycho 100 ladder

What this does not settle

One fight in one work. It is the only result the record gives between these two, and it is evidence about that meeting and nothing wider — not a general matchup, not a rematch, and not a ranking of its own.

The ladder above it is argued from everything either of them has been shown doing; this page is argued from one citation.

Where the two disagree, the disagreement is the point, and it stays visible rather than being resolved by whichever of them happens to be on this page.

Data: CC BY 4.0. Reuse with credit to citedfeats.com.