Noguchi was a Mito han samurai. He joined the Roshigumi with Serizawa Kamo.
He wasn't in the Yagi Gennojo's house when Serizawa was assassinated.
However he was ordered to commit Seppuku 3 months later.
The reason is unknown.
References
- Shinsengumi Taishi Den (新選組隊士伝) Gakken
- Shinsengumi Zentaishi Tettei Guide (新選組全隊士徹底ガイド) Maeda Masaki