16-sai, Hajimete.

From Chibi Manga:

I'll give you my first time...

Haru-chan is a boy who's beautiful like a girl. To Hana, he's an important friend like a "best girlfriend"
...so she thought...

Then they were locked together in the pool during a power outage. Relationship between the two has always been the same, they thought, yet...

Sweet 16, It feels like something will change.