Back from his journey across Japan, Yuuta Takemoto reminisces about his college life so far. He has matured significantly since his second year and is motivated to move forward. Feeling more confident than ever before, he finally confesses to Hagumi Hanamoto, the girl he has been in love with since their first encounter. However, Hagumi has been confused by her attempts to understand the mysterious Shinobu Morita. Hiding behind a playful demeanor, Morita may be the most burdened by his own potential. Meanwhile, Takumi Mayama has become a full-fledged working adult and has landed Ayumi Yamada several pottery orders through his company in an act of friendship. The five youths continue to face individual hardships in academics, work, love, and friendship as they push each other toward the paths that they are destined to walk. [Written by MAL Rewrite]

A boy gets involved in an accident when in kindergarten, horribly damaging his arm, but the doctors somehow manage to save it. Now, several years later, his arm seems to be becoming the focus of strange events as it turns out to be more than a normal arm. Meanwhile, a secret organizations is out to get hold of him and the power he possess.

The 2nd Chapter continues the story of Ryo Takatsuki and his companions' quest to discover the secret of the mysterious A.R.M.S. they all possess and what the future may hold for them. They now know where the answers lie but to get to them, they must fight a desperate fight of survival against a powerful military corporation that wants their secrets no matter what the cost. (Source: AniDB)

An OVA that takes place during the manga's middle school storyline.