永光寺, Buddhist temple in Koga, Japan

Eikoji Temple in Koga is a Buddhist complex with multiple traditional Japanese buildings arranged across spacious grounds dedicated to religious practice and meditation. The layout includes several distinct prayer halls connected by paths, creating a coherent sanctuary for worship and contemplation.

The temple was founded in 843 by the monk Muzen (無善和尚) as a Shingon-shū Buzan-ha temple, under the mountain name Dōrakuzan and the temple name Jizō-in. In 1782, around the time of the 18th abbot Yūkaku, its halls were completed and it prospered with many branch temples. A hall memorial tower was erected in 1791 in praise of Muzen's virtue, inscribed with 21 disciples.

Eikoji is the outside stop (bangai) number 21 of the Katsushika Bandō Kannon pilgrimage. Each temple on this route has its own goeika hymn, and at Eikoji pilgrims chant: "Nanigoto mo Ozaki no tera no Kanzeon tanomu sugata zo utsukushiki kana." Chanting it is held to bring the same merit as reading sutras.

The temple is easily reached by bus with several stops within walking distance, and the grounds are straightforward to navigate on foot. The presence of an attached kindergarten means the space is busier during school hours and quieter at other times.

Each spring from April through May the grounds burst with large peony blooms, plum blossoms, cherry flowers, and azaleas planted throughout different sections. This seasonal transformation draws visitors specifically seeking the natural beauty rather than the religious aspects alone.