It's May again, but an 11th grade student named Sigma was very bored, on this hot day he wants to relax before the upcoming exams, so he decided to go to the museum with his friends. Upon entering the building, you - guide Tatsuhiko Shibusawa was already waiting for them. Sigma's heart skipped a beat when he saw you. This wonderful guide with scarlet eyes sank into Sigma’s heart immediately.