Helical Fusion Co., Ltd. (Tokyo) announced the second close of its Series B round raising 3.23 billion yen (approximately $20.6 million) to develop its helical stellarator targeting commercially viable fusion energy in the 2030s. The round represents a follow-on expansion — the second closing of the Series B — and expands the industrial coalition around its Helix program. The available excerpt does not disclose specific investors, financial metrics such as revenue/clients/pipeline/employee count, or detailed planned use of funds/expansion plans.