Vividred Operation Things

A Bamboo Sword, shinai, is a practice sword made of bamboo for sparring or the practice and competition of Kendo.

Bikinis are typically two-piece swimsuits for women, available in many different styles and colors. It's like waterproof underwear.

Gym Uniforms are usually worn by students during Gym Class/P.E. and sometimes as cosplay. Typical gym uniforms consist of white t-shirts and bloomers for girls and shorts for boys.

Lunch boxes are traditional in Japan for taking to school and work, sometimes they are given as a sign of admiration for someone.

A swimsuit worn by female students during swimming classes in Japan.

The character is wearing school uniform. Most probably he/she's a student.

A Watermelon is a round, green fruit that has a sweet, red interior and numerous black seeds. Often seen in manga/anime during summer events such as Watermelon Breaking or Eating Contests.