attributed to the successful launch of two new hotels, ENT TERRACE Asakusa and ENT TERRACE Akihabara, during the fiscal year ended June 30, 2023.
Other revenue increased by 29.3% to JPY212,731 thousand (approximately $1,568 thousand) in the fiscal year ended June 30, 2022 from JPY164,497 thousand (approximately $1,212 thousand) in the fiscal year ended June 30, 2021, primarily due to higher miscellaneous sales, including higher property management revenue, real estate brokerage commissions, and higher hotel revenue compared to the prior fiscal year.
Cost of Revenue and Gross Margin
Cost of revenue for real estate sales increased by 22.7% to JPY14,294,254 (approximately $100,327) in the fiscal year ended June 30, 2023, from JPY11,812,347 thousand (approximately $87,054 thousand) in the fiscal year ended June 30, 2022, primarily reflecting increases in construction cost, such as labor costs and material costs.
Cost of revenue for real estate sales increased by 22.4% year-over-year to JPY11,812,347 thousand (approximately $87,054 thousand) in the fiscal year ended June 30, 2022, primarily reflecting higher direct costs associated with higher revenue.
Gross margin decreased to 15.8% in the fiscal year ended June 30, 2023, compared to 17% in the fiscal year ended June 30, 2022, primarily driven by the increase in construction costs, such as labor costs and material costs.
Gross margin increased to 17% in the fiscal year ended June 30, 2022, compared to 13.2% in the fiscal year ended June 30, 2021, primarily driven by higher deliveries of condominiums and higher average selling price of land.
Selling, General, and Administrative Expenses
Selling, general, and administrative expenses were JPY1,886,533 (approximately $13,058) in the fiscal year ended June 30, 2023, compared to JPY1,786,614 thousand (approximately $13,167 thousand) in the fiscal year ended June 30, 2022. As a percentage of revenue, selling, general, and administrative expenses decreased to 10.8% in the fiscal year ended June 30, 2023, from 12.5% in the fiscal year ended June 30, 2022, due to reduced IPO preparation expenses.
Selling, general, and administrative expenses were JPY1,786,614 thousand (approximately $13,167 thousand) in the fiscal year ended June 30, 2022, compared to JPY1,033,402 thousand (approximately $7,616 thousand) in the fiscal year ended June 30, 2021. As a percentage of revenue, selling, general, and administrative expenses increased to 12.5% in the fiscal year ended June 30, 2022, from 9.2% in the fiscal year ended June 30, 2021, due to higher indirect costs, including expensed IPO preparation expenses, offset by higher revenue.
Operating Margin
As a result of the foregoing, operating income increased by 41.0% year-over-year to JPY869,918 (approximately $6,021) in the fiscal year ended June 30, 2023 and operating profit margin increased to 5.0%, and operating income increased by 43% to JPY649,188 thousand (approximately $4,784 thousand) in the fiscal year ended June 30, 2022 from JPY453,647 thousand (approximately $3,343 thousand) in the fiscal year ended June 30, 2021 and operating profit margin increased from 4.5% to 4.0%.
Interest Expenses
Interest expenses decreased to JPY16,731 (approximately $116) in the fiscal year ended June 30, 2023 from JPY23,333 thousand (approximately $172 thousand) in the fiscal year ended June 30, 2022, reflecting higher amounts of capitalized interest associated with an increase in the number of our development projects, which offset increases in net borrowings and interest expense.
Interest expenses decreased to JPY23,333 thousand (approximately $172 thousand) in the fiscal year ended June 30, 2022 from JPY56,650 thousand (approximately $417 thousand) in the fiscal year ended June 30, 2021, reflecting higher amounts of capitalized interest associated with our increased number of development projects, which offset higher net borrowings and interest incurred.