Type A × Type BBlood type compatibility
Type A — The Perfectionist Type B — The Free Spirit
The chart's classic mismatch — routine meets improvisation. It's the pairing most likely to be labelled “tricky” and the one most likely to prove the label wrong.
For entertainment only. Blood type compatibility (ketsueki-gata aishō) is a popular Japanese cultural belief and is not supported by science. Please don’t use it to make real relationship decisions.
How Type A sees Type B
To a Type A, Type B is exciting and slightly alarming. B does the thing A spent three days deciding not to do, and it works out. A admires that more than they let on. What wears A down isn't the spontaneity — it's the small unreliabilities: the message not answered, the plan changed at the door, the detail dropped and not noticed.
How Type B sees Type A
To a Type B, Type A is thoughtful and, at times, exhausting. B doesn't understand the amount of internal accounting A is running, so B reads A's careful checking as worry about nothing — or worse, as disapproval. B rarely intends the friction. B genuinely didn't know the reservation mattered.
What works
When it works, each one loosens the other's failure mode. B talks A out of over-planning a Saturday; A talks B into finishing the thing they started in March. Both end up living slightly more like the person they said they wanted to be.
Where it breaks
It breaks on communication style, not affection. A hints; B misses hints entirely. A escalates internally while saying nothing; B has no idea there is anything to respond to. By the time A says it plainly, A has already been angry for a while — and B, hearing it for the first time, feels ambushed.
By situation
- Dating — High potential, high maintenance. Requires the least Japanese thing in the world: saying the awkward part out loud, early.
- At work — Surprisingly strong if roles are explicit. B explores, A converts it into something shippable. Fails when both are asked to share one process.
- As friends — Often easier as friends than partners — the same differences, with less at stake.
One thing that helps
A: state the need as a sentence, not a mood. B: when A asks a small logistical question, answer it — that is the affection.
Every pairing
All ten combinations of A, B, O and AB — each page covers both points of view.
- A × O High
- A × AB High
- B × AB High
- A × B Tricky
- B × O Steady
- O × AB Steady
- A × A Steady
- B × B Steady
- O × O Steady
- AB × AB Steady
Prefer the grid? See the full 4×4 compatibility chart.