Problem is, the line was busy, so I had no choice but to run out and find someone.

By the time I got a kappa doctor to the scene, Reisen had lost consciousness.

One hour later, Reisen passed away.

The kappa did everything they could, but it wasn't enough.

That's the gist of it.

Huh?

The call was recorded. I got a copy of the track, so let's have a listen, shall we?

It starts at 3:11 PM.

No, it was a kappa model. All the lab workers had one, so Reisen and I borrowed some too.

I figured that even if I went to the custodian and opened the exit, the culprit would be long gone.

I ran into some kappa doing maintenance in the hallway who told me where the medical room was located.

We only found this out later, but... It seems that the person speaking to the custodian at the time I called was actually the culprit.

Boiler room

Ringo

Reisen

Storeroom

Courtyard

Night duty room

Storeroom

Lecture room

XX-sama's investigation confirmed that every kappa at the laboratory had an alibi. At least we knew that they came from the outside.

By phone, you mean the Moon Rabbit kind?