Time flies by; Hiroyuki and Akari are 12th-graders now. Both of them and their friends have grown up gradually in someway, physically or mentally, but one of their best friends is missing: the lifelike android Multi. To their surprise, Multi is brought to their campus again without notice, yet she is no longer the same Multi they have known.

The story took place in the early days of the Sirius War. Newcomers on the battlefield fight bravely. Proving their value as a new generation of super-warriors on the front lines. However, when they followed their superiors, they were attacked by the Black Army, and the chiefs died. The battlefield fell and was forced to retreat. Comrades in the previous battle were just ordinary humans. They think that they died in the attack of the black army, but it turns out he survived.

The adorable and attractive main characters of Haru wo Daiteita are Kyousuke Iwaki and Youji Katou who are both in the film industry, having starred in various adult video films and are trying to climb the ladder of success and become greater actors. Iwaki is accepted to star in a popular movie, having beaten Katou in the auditions. During their time together, Katou believes he is in love with Iwaki-San, who on the contrary refuses to believe that he is in love. It is later on that another gay actor comes back to Japan and co-stars with Katou that problems starting arising. And it is from then on that the two realise where their hearts are set.

Sakamichi Onoda is an otaku who just wants to find more people to join the recently disbanded anime club with him. However, when a couple cyclists spy his skill in riding the bulky mamachari bike he's had since youth, they attempt to convince him to join the bicycle racing club instead. An OVA bundled with the 29th volume of the comic book.