Rika Shiguma is a character from Boku wa Tomodachi ga Sukunai.
Boku wa Tomodachi ga Sukunai (anime)
She has a Dream Sequence where Kodaka Hasegawa is having a Bath in a Hot Spring and jumps in with him while wearing a Swimsuit but then appears naked when coming up because she was wearing a special swimsuit that turns transparent when wet.
Boku wa Tomodachi ga Sukunai NEXT
Scan from Dengeki G Magazine