20-year-old freeter Kasumi is a girl with a casual and cute charm. Living her daily life with a pure heart, she occasionally gets caught up in trouble, such as being solicited for a handjob. When a man helps her out of one such incident, she feels deeply grateful and decides to invite him on a date herself. Kasumi takes the lead, approaching him assertively, while he hesitantly accepts her feelings. The date quickly unfolds at her pace, culminating in her confessing her love. Overcome with joy, the man eagerly heads to a hotel with her. Taking the big step of having sex for the first time, their relationship deepens instantly.